Bump twig/twig from 2.11.3 to 2.12.0

[dependabot-preview]

Bumps twig/twig from 2.11.3 to 2.12.0.

Changelog

Sourced from twig/twig's changelog.

• 2.12.0 (2019-10-05)

• added the spaceship operator ("<=>"), useful when using an arrow function in the "sort" filter

• added support for an "arrow" function on the "sort" filter

• added the CssInliner extension in the "extra" repositories: "inline_css"
  filter

• added the Inky extension in the "extra" repositories: "inky_to_html" filter

• added Intl extension in the "extra" repositories: "country_name",
  "currency_name", "currency_symbol", "language_name", "locale_name",
  "timezone_name", "format_currency", "format_number",
  "format_*_number", "format_datetime", "format_date", and "format_time"
  filters, and the "country_timezones" function

• added the Markdown extension in the "extra" repositories: "markdown_to_html",
  and "html_to_markdown" filters

• added the HtmlExtension extension in the "extra" repositories: "date_uri"
  filter, and "html_classes" function

• optimized "block('foo') ?? 'bar'"

• fixed the empty test on Traversable instances

• fixed array_key_exists() on objects

• fixed cache when opcache is installed but disabled

• fixed using macros in arrow functions

• fixed split filter on edge case

Commits

• c7a85fd Prepare the 2.12.0 release
• 231a365 Update CHANGELOG
• 4625774 feature #3157 Twig 2 is compatible with PHP 7.0 (nicolas-grekas)
• f8c5f86 Merge branch '1.x' into 2.x
• 8909a16 minor #3163 Fix issue #3159 (ericmorand)
• cfac11e Fix issue #3159
• 0d2b2aa minor #3164 Fix issue #3160 (ericmorand)
• 4eb40f2 Fix issue #3160
• b845ed9 Twig 2 is compatible with PHP 7.0
• c2fd999 Merge branch '1.x' into 2.x
• Additional commits viewable in compare view

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