Use functools.wraps when wrapping synchronous handlers

[Gallaecio]

What do these changes do?

They change the code that wraps synchronous functions, using functools.wraps to ensure that aspects from the synchronous functions such as __doc__ are also available on the wrapper.

This allows to use aiohttp-swagger with synchronous handlers.

Are there changes in behavior for the user?

When accessed from the app, synchronous route handlers will now include additional metadata that before only asynchronous handlers provided.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
  It’s a bug fix which should not affect the documentation.
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new entry to CHANGES.rst
  • Choose any open position to avoid merge conflicts with other PRs.
  • Add a link to the issue you are fixing (if any) using #issue_number format at the end of changelog message. Use Pull Request number if there are no issues for PR or PR covers the issue only partially.

[codecov-io]

Codecov Report

Merging #1953 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1953      +/-   ##
==========================================
+ Coverage   97.05%   97.05%   +<.01%     
==========================================
  Files          37       37              
  Lines        7610     7612       +2     
  Branches     1328     1328              
==========================================
+ Hits         7386     7388       +2     
  Misses        101      101              
  Partials      123      123

Impacted Files	Coverage Δ
aiohttp/web_urldispatcher.py	99.41% <100%> (ø)	⬆️

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[asvetlov]

Thanks!

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