chore(deps): update dependency requests to v2.20.0

[mend-for-github-com]

This PR contains the following updates:

Package	Update	Change
requests (source, changelog)	minor	==2.9.1 -> ==2.20.0

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	CVE
High	7.5	CVE-2018-18074

---

Release Notes

psf/requests

v2.20.0

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Bugfixes

• Content-Type header parsing is now case-insensitive (e.g.
  charset=utf8 v Charset=utf8).
• Fixed exception leak where certain redirect urls would raise
  uncaught urllib3 exceptions.
• Requests removes Authorization header from requests redirected
  from https to http on the same hostname. (CVE-2018-18074)
• should_bypass_proxies now handles URIs without hostnames (e.g.
  files).

Dependencies

• Requests now supports urllib3 v1.24.

Deprecations

• Requests has officially stopped support for Python 2.6.

v2.19.1

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Bugfixes

• Fixed issue where status_codes.py's init function failed trying
  to append to a __doc__ value of None.

v2.19.0

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Improvements

• Warn user about possible slowdown when using cryptography version
  < 1.3.4
• Check for invalid host in proxy URL, before forwarding request to
  adapter.
• Fragments are now properly maintained across redirects. (RFC7231
  7.1.2)
• Removed use of cgi module to expedite library load time.
• Added support for SHA-256 and SHA-512 digest auth algorithms.
• Minor performance improvement to Request.content.
• Migrate to using collections.abc for 3.7 compatibility.

Bugfixes

• Parsing empty Link headers with parse_header_links() no longer
  return one bogus entry.
• Fixed issue where loading the default certificate bundle from a zip
  archive would raise an IOError.
• Fixed issue with unexpected ImportError on windows system which do
  not support winreg module.
• DNS resolution in proxy bypass no longer includes the username and
  password in the request. This also fixes the issue of DNS queries
  failing on macOS.
• Properly normalize adapter prefixes for url comparison.
• Passing None as a file pointer to the files param no longer
  raises an exception.
• Calling copy on a RequestsCookieJar will now preserve the cookie
  policy correctly.

Dependencies

• We now support idna v2.7.
• We now support urllib3 v1.23.

v2.18.4

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Improvements

• Error messages for invalid headers now include the header name for
  easier debugging

Dependencies

• We now support idna v2.6.

v2.18.3

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Improvements

• Running $ python -m requests.help now includes the installed
  version of idna.

Bugfixes

• Fixed issue where Requests would raise ConnectionError instead of
  SSLError when encountering SSL problems when using urllib3 v1.22.

v2.18.2

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Bugfixes

• requests.help no longer fails on Python 2.6 due to the absence of
  ssl.OPENSSL_VERSION_NUMBER.

Dependencies

• We now support urllib3 v1.22.

v2.18.1

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Bugfixes

• Fix an error in the packaging whereby the *.whl contained
  incorrect data that regressed the fix in v2.17.3.

v2.18.0

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Improvements

• Response is now a context manager, so can be used directly in a
  with statement without first having to be wrapped by
  contextlib.closing().

Bugfixes

• Resolve installation failure if multiprocessing is not available
• Resolve tests crash if multiprocessing is not able to determine the
  number of CPU cores
• Resolve error swallowing in utils set_environ generator

v2.17.3

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Improvements

• Improved packages namespace identity support, for monkeypatching
  libraries.

v2.17.2

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Improvements

• Improved packages namespace identity support, for monkeypatching
  libraries.

v2.17.1

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Improvements

• Improved packages namespace identity support, for monkeypatching
  libraries.

v2.17.0

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Improvements

• Removal of the 301 redirect cache. This improves thread-safety.

v2.16.5

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• Improvements to $ python -m requests.help.

v2.16.4

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• Introduction of the $ python -m requests.help command, for
  debugging with maintainers!

v2.16.3

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• Further restored the requests.packages namespace for compatibility
  reasons.

v2.16.2

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• Further restored the requests.packages namespace for compatibility
  reasons.

No code modification (noted below) should be necessary any longer.

v2.16.1

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• Restored the requests.packages namespace for compatibility
  reasons.
• Bugfix for urllib3 version parsing.

Note: code that was written to import against the
requests.packages namespace previously will have to import code that
rests at this module-level now.

For example:

from requests.packages.urllib3.poolmanager import PoolManager

Will need to be re-written to be:

from requests.packages import urllib3
urllib3.poolmanager.PoolManager

Or, even better:

from urllib3.poolmanager import PoolManager

v2.16.0

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• Unvendor ALL the things!

v2.15.1

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• Everyone makes mistakes.

v2.15.0

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Improvements

• Introduction of the Response.next property, for getting the next
  PreparedResponse from a redirect chain (when
  allow_redirects=False).
• Internal refactoring of __version__ module.

Bugfixes

• Restored once-optional parameter for
  requests.utils.get_environ_proxies().

v2.14.2

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Bugfixes

• Changed a less-than to an equal-to and an or in the dependency
  markers to widen compatibility with older setuptools releases.

v2.14.1

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Bugfixes

• Changed the dependency markers to widen compatibility with older pip
  releases.

v2.14.0

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Improvements

• It is now possible to pass no_proxy as a key to the proxies
  dictionary to provide handling similar to the NO_PROXY environment
  variable.
• When users provide invalid paths to certificate bundle files or
  directories Requests now raises IOError, rather than failing at
  the time of the HTTPS request with a fairly inscrutable certificate
  validation error.
• The behavior of SessionRedirectMixin was slightly altered.
  resolve_redirects will now detect a redirect by calling
  get_redirect_target(response) instead of directly querying
  Response.is_redirect and Response.headers['location']. Advanced
  users will be able to process malformed redirects more easily.
• Changed the internal calculation of elapsed request time to have
  higher resolution on Windows.
• Added win_inet_pton as conditional dependency for the [socks]
  extra on Windows with Python 2.7.
• Changed the proxy bypass implementation on Windows: the proxy bypass
  check doesn't use forward and reverse DNS requests anymore
• URLs with schemes that begin with http but are not http or
  https no longer have their host parts forced to lowercase.

Bugfixes

• Much improved handling of non-ASCII Location header values in
  redirects. Fewer UnicodeDecodeErrors are encountered on Python 2,
  and Python 3 now correctly understands that Latin-1 is unlikely to
  be the correct encoding.
• If an attempt to seek file to find out its length fails, we now
  appropriately handle that by aborting our content-length
  calculations.
• Restricted HTTPDigestAuth to only respond to auth challenges made
  on 4XX responses, rather than to all auth challenges.
• Fixed some code that was firing DeprecationWarning on Python 3.6.
• The dismayed person emoticon (/o\\) no longer has a big head. I'm
  sure this is what you were all worrying about most.

Miscellaneous

• Updated bundled urllib3 to v1.21.1.
• Updated bundled chardet to v3.0.2.
• Updated bundled idna to v2.5.
• Updated bundled certifi to 2017.4.17.

v2.13.0

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Features

• Only load the idna library when we've determined we need it. This
  will save some memory for users.

Miscellaneous

• Updated bundled urllib3 to 1.20.
• Updated bundled idna to 2.2.

v2.12.5

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Bugfixes

• Fixed an issue with JSON encoding detection, specifically detecting
  big-endian UTF-32 with BOM.

v2.12.4

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Bugfixes

• Fixed regression from 2.12.2 where non-string types were rejected in
  the basic auth parameters. While support for this behaviour has been
  re-added, the behaviour is deprecated and will be removed in the
  future.

v2.12.3

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Bugfixes

• Fixed regression from v2.12.1 for URLs with schemes that begin with
  "http". These URLs have historically been processed as though they
  were HTTP-schemed URLs, and so have had parameters added. This was
  removed in v2.12.2 in an overzealous attempt to resolve problems
  with IDNA-encoding those URLs. This change was reverted: the other
  fixes for IDNA-encoding have been judged to be sufficient to return
  to the behaviour Requests had before v2.12.0.

v2.12.2

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Bugfixes

• Fixed several issues with IDNA-encoding URLs that are technically
  invalid but which are widely accepted. Requests will now attempt to
  IDNA-encode a URL if it can but, if it fails, and the host contains
  only ASCII characters, it will be passed through optimistically.
  This will allow users to opt-in to using IDNA2003 themselves if they
  want to, and will also allow technically invalid but still common
  hostnames.
• Fixed an issue where URLs with leading whitespace would raise
  InvalidSchema errors.
• Fixed an issue where some URLs without the HTTP or HTTPS schemes
  would still have HTTP URL preparation applied to them.
• Fixed an issue where Unicode strings could not be used in basic
  auth.
• Fixed an issue encountered by some Requests plugins where
  constructing a Response object would cause Response.content to
  raise an AttributeError.

v2.12.1

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Bugfixes

• Updated setuptools 'security' extra for the new PyOpenSSL backend in
  urllib3.

Miscellaneous

• Updated bundled urllib3 to 1.19.1.

v2.12.0

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Improvements

• Updated support for internationalized domain names from IDNA2003 to
  IDNA2008. This updated support is required for several forms of IDNs
  and is mandatory for .de domains.
• Much improved heuristics for guessing content lengths: Requests will
  no longer read an entire StringIO into memory.
• Much improved logic for recalculating Content-Length headers for
  PreparedRequest objects.
• Improved tolerance for file-like objects that have no tell method
  but do have a seek method.
• Anything that is a subclass of Mapping is now treated like a
  dictionary by the data= keyword argument.
• Requests now tolerates empty passwords in proxy credentials, rather
  than stripping the credentials.
• If a request is made with a file-like object as the body and that
  request is redirected with a 307 or 308 status code, Requests will
  now attempt to rewind the body object so it can be replayed.

Bugfixes

• When calling response.close, the call to close will be
  propagated through to non-urllib3 backends.
• Fixed issue where the ALL_PROXY environment variable would be
  preferred over scheme-specific variables like HTTP_PROXY.
• Fixed issue where non-UTF8 reason phrases got severely mangled by
  falling back to decoding using ISO 8859-1 instead.
• Fixed a bug where Requests would not correctly correlate cookies set
  when using custom Host headers if those Host headers did not use the
  native string type for the platform.

Miscellaneous

• Updated bundled urllib3 to 1.19.
• Updated bundled certifi certs to 2016.09.26.

v2.11.1

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Bugfixes

• Fixed a bug when using iter_content with decode_unicode=True for
  streamed bodies would raise AttributeError. This bug was
  introduced in 2.11.
• Strip Content-Type and Transfer-Encoding headers from the header
  block when following a redirect that transforms the verb from
  POST/PUT to GET.

v2.11.0

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Improvements

• Added support for the ALL_PROXY environment variable.
• Reject header values that contain leading whitespace or newline
  characters to reduce risk of header smuggling.

Bugfixes

• Fixed occasional TypeError when attempting to decode a JSON
  response that occurred in an error case. Now correctly returns a
  ValueError.
• Requests would incorrectly ignore a non-CIDR IP address in the
  NO_PROXY environment variables: Requests now treats it as a
  specific IP.
• Fixed a bug when sending JSON data that could cause us to encounter
  obscure OpenSSL errors in certain network conditions (yes, really).
• Added type checks to ensure that iter_content only accepts
  integers and None for chunk sizes.
• Fixed issue where responses whose body had not been fully consumed
  would have the underlying connection closed but not returned to the
  connection pool, which could cause Requests to hang in situations
  where the HTTPAdapter had been configured to use a blocking
  connection pool.

Miscellaneous

• Updated bundled urllib3 to 1.16.
• Some previous releases accidentally accepted non-strings as
  acceptable header values. This release does not.

v2.10.0

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New Features

• SOCKS Proxy Support! (requires PySocks;
  $ pip install requests[socks])

Miscellaneous

• Updated bundled urllib3 to 1.15.1.

v2.9.2

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Improvements

• Change built-in CaseInsensitiveDict (used for headers) to use
  OrderedDict as its underlying datastore.

Bugfixes

• Don't use redirect_cache if allow_redirects=False
• When passed objects that throw exceptions from tell(), send them
  via chunked transfer encoding instead of failing.
• Raise a ProxyError for proxy related connection issues.

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