Bump sass from 1.17.4 to 1.18.0

[dependabot-preview]

Bumps sass from 1.17.4 to 1.18.0.

Release notes

Sourced from sass's releases.

Dart Sass 1.18.0

To install Dart Sass 1.18.0, download one of the packages above and add it to your PATH, or see the Sass website for full installation instructions.

Changes

• Avoid recursively listing directories when finding the canonical name of a file on case-insensitive filesystems.

• Fix importing files relative to package:-imported files.

• Don't claim that "package:" URLs aren't supported when they actually are.

Command-Line Interface

• Add a --no-charset flag. If this flag is set, Sass will never emit a [@​charset](https://github.com/charset) declaration or a byte-order mark, even if the CSS file contains non-ASCII characters.

Dart API

• Add a charset option to compile(), compileString(), compileAsync() and compileStringAsync(). If this option is set to false, Sass will never emit a [@​charset](https://github.com/charset) declaration or a byte-order mark, even if the CSS file contains non-ASCII characters.

• Explicitly require that importers' canonicalize() methods be able to take paths relative to their outputs as valid inputs. This isn't considered a breaking change because the importer infrastructure already required this in practice.

See the full changelog for changes in earlier releases.

Changelog

Sourced from sass's changelog.

1.18.0

• Avoid recursively listing directories when finding the canonical name of a
  file on case-insensitive filesystems.

• Fix importing files relative to package:-imported files.

• Don't claim that "package:" URLs aren't supported when they actually are.

Command-Line Interface

• Add a --no-charset flag. If this flag is set, Sass will never emit a
  [@​charset](https://github.com/charset) declaration or a byte-order mark, even if the CSS file contains
  non-ASCII characters.

Dart API

• Add a charset option to compile(), compileString(), compileAsync() and
  compileStringAsync(). If this option is set to false, Sass will never emit
  a [@​charset](https://github.com/charset) declaration or a byte-order mark, even if the CSS file contains
  non-ASCII characters.

• Explicitly require that importers' canonicalize() methods be able to take
  paths relative to their outputs as valid inputs. This isn't considered a
  breaking change because the importer infrastructure already required this in
  practice.

Commits

• 3b3a43a Add a --charset flag and API option (#644)
• 59800ad Don't recursively list directories in realCasePath() (#641)
• 495c6f3 Only claim "package:" URLs are unsupported on Node (#637)
• 9621979 Update the Heroku auth token (#640)
• c2c9ced Extend RecursiveStatementVisitor for expressions (#639)
• 8c9412b Fix importing files relative to "package:" imports (#638)
• See full diff in compare view

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