Update sass requirement from ^1.29.0 to ^1.30.0

[dependabot[bot]]

Updates the requirements on sass to permit the latest version.

Release notes

Sourced from sass's releases.

Dart Sass 1.30.0

To install Sass 1.30.0, download one of the packages below and add it to your PATH, or see the Sass website for full installation instructions.

Changes

• Fix a bug where @at-root (without: all) wouldn't properly remove a @keyframes context when parsing selectors.

Node JS API

• The generated main() function in sass.js now returns a Promise that completes when the executable is finished running.

Dart API

• Fix a bug that prevented importers from returning null when loading from a URL that they had already canonicalized.

See the full changelog for changes in earlier releases.

Changelog

Sourced from sass's changelog.

1.30.0

• Fix a bug where @at-root (without: all) wouldn't properly remove a @keyframes context when parsing selectors.

Node JS API

• The generated main() function in sass.js now returns a Promise that completes when the executable is finished running.

Dart API

• Fix a bug that prevented importers from returning null when loading from a URL that they had already canonicalized.

1.29.0

• Support a broader syntax for @supports conditions, based on the latest Editor's Draft of CSS Conditional Rules 3. Almost all syntax will be allowed (with interpolation) in the conditions' parentheses, as well as function syntax such as @supports selector(...).

1.28.0

• Add a color.hwb() function to sass:color that can express colors in HWB format.

• Add color.whiteness() and color.blackness() functions to sass:color to get a color's HWB whiteness and blackness components.

• Add $whiteness and $blackness parameters to color.adjust(), color.change(), and color.scale() to modify a color's HWB whiteness and blackness components.

Dart API

• Add HWB support to the SassColor class, including a SassColor.hwb() constructor, whiteness and blackness getters, and a changeHwb() method.

... (truncated)

Commits

• 43f4607 Update cli_pkg (#1153)
• a13f7be Apply the change in #1139 to the asynchronous source file (#1150)
• 50985d7 Fix Travis CI (#1149)
• b826bd3 Add an upper bound to our test constraint
• 0bb0584 Disable Node.js tests on Dart dev
• 4f1f5c9 Fix for importers that return null in load (#1139)
• 6986dcf Update CONTRIBUTING.md (#1136)
• c0e6ba1 Fix a buggy interaction between @at-root and @keyframes (#1135)
• See full diff in compare view

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