Bump cerdic/css-tidy from 1.5.6 to 1.5.7

[dependabot-preview]

Bumps cerdic/css-tidy from 1.5.6 to 1.5.7.

Changelog

Sourced from cerdic/css-tidy's changelog.

Changelog

Key: # = backwards incompatible change, ! = new feature, - = bugfix.

1.4, unknown release date

CSSTidy is now licensed under LGPL!

! csstidy->set_cfg now accept a single parameter, an associative array, to
set all configuration options
! Templates can now be loaded via set_cfg using the 'template' config
parameter
! csstidy_print->formatted_page added, returns a full XHTML page based
off of csstidy_print->formatted
! cssparsed.css created, contains just the CSS for formatted CSS output
! New CSS 3 units "ch" and "turn" added
! Unit tests added, requires Text_Diff (PEAR) and SimpleTest
! Some invalid selectors are now removed during optimization, this can
be turned off by setting 'discard_invalid_selectors' to false

• Added localizations for css_optimiser.php
• Fixed bug with cookie setting for custom templates
• Minor security problem in css_optimiser.php fixed
• Fixed bug with float handling in exotic locales
• Fixed bug with non-functioning getenv in ASAPI
• Fixed bug with bad hexadecimal syntax recovery
• At-selectors optimized by removing unnecessary url()
• Fixed optimisation: 1.0 was not optimised to 1
• Fixed incorrect parsing of !imporant close to numbers
• Allowed Copy to Clipboard for Firefox if preference set (if not, gives
  instructions on how to add and warning re: security)

Commits

• 226bca0 Markdown README
• d3762ee v1.5.7 : PHP 7 compatibility, composer update, Travis CI integration
• 99e09a5 returning non-zero if tests fail
• 44b11fe Adding back Deprecated errors so deprecations can be caught by tests
• e79afae adding "no-api" for travis
• 1da1a11 Adding travis yml, making test dependencies loadable via composer
• fde04e7 php each function is deprecated
• 491d4fb update LGPL version according to Composer needs
• 28fe1d6 Fix #48 : Allow using CSS3.0 level with optimiser interface
• 81c50d0 Unit test for #48 : test OK in CSS 3.0
• Additional commits viewable in compare view

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