Update autoprefixer requirement to ^9.0.0

[dependabot-preview[bot]]

Updates the requirements on autoprefixer to permit the latest version.

Release notes

*Sourced from [autoprefixer's releases](https://github.com/postcss/autoprefixer/releases).* > ## 9.0 “A Mari Usque Ad Mare” > > > Autoprefixer 9.0 brings Browserslist 4.0 and drops Node.js 4 support. > > ## Breaking Changes > > We removed Node.js 4 and Node.js 9 support since it doesn’t have security updates anymore. > > We removed IE and “dead” browsers (without security updates) from Babel’s targets: > > ``` > last 2 version > not dead > not Explorer 11 > not ExplorerMobile 11 > node 10 > node 8 > node 6 > ``` > > [Autoprefixer Rails](https://github.com/ai/autoprefixer-rails) 9.0 dropped the RubyRacer and Sprockets 3 support. > > ## Browserslist 4.0 > > Autoprefixer 9.0 uses [Browserslist](https://github.com/browserslist/browserslist) 4.0 to get your target browsers. > > Now you use Browserslist to specify Node.js versions. Babel 7 will use Browserslist config as well. > > Also, Browserslist 4.0 will warn you if you didn’t update Can I Use DB for last than 6 month. > > ## PostCSS 7.0 > > Autoprefixer 9.0 uses [PostCSS 7.0](https://github.com/postcss/postcss/releases/tag/7.0.0)

Changelog

*Sourced from [autoprefixer's changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md).* > # Change Log > This project adheres to [Semantic Versioning](http://semver.org/). > > ## 9.0 “A Mari Usque Ad Mare” > * Remove Node.js 9 and Node.js 4 support. > * Remove IE and “dead” browsers from Babel. > * Use PostCSS 7.0. > * Use Browserslist 4.0. > > ## 8.6.5 > * Do not show Grid warnings if IE was not selected. > > ## 8.6.4 > * Fix `stretch` prefix in Chrome >= 46. > > ## 8.6.3 > * Add warnings for unsupported Grid features. > * Add warnings about wrong Grid properties. > * Add note about `grid` option for grid properties in `autoprefixer --info`. > > ## 8.6.2 > * Fix error during adding Grid prefixes in `[**media**](https://github.com/media)` (by Evgeny Petukhov). > > ## 8.6.1 > * Fix `grid-template` with media queries (by Evgeny Petukhov). > > ## 8.6 “Follow Reason” > * Add `gap` support (by Evgeny Petukhov). > * Add two values support for `grid-gap` and `gap` (by Evgeny Petukhov). > * Add `ignoreUnknownVersions` option for Browserslist. > > ## 8.5.2 > * Fix `grid-template` support wit auto row sizes (by Yury Timofeev). > > ## 8.5.1 > * Remove unnecessary warning on `-webkit-fill-available`. > > ## 8.5 “Muito Nobre e Sempre Leal” > * Add `grid-gap` support (by Evgeny Petukhov). > * Fix radial gradients direction fix. > * Fix docs (by Phani Kandula and Huáng Jùnliàng). > > ## 8.4.1 > * Fix working in old PostCSS versions (by Diablohu). > > ## 8.4 “Non in aves, sed in angues” > * Add `/* autoprefixer: ignore next */` control comment (by Pavel Vostrikov). > > ## 8.3 “Benigno Numine” > * Add `[**media**](https://github.com/media)` support to `grid-template` (by Evgeny Petukhov). > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/postcss/autoprefixer/commits/9.0.0)

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[dependabot-preview[bot]]

Superseded by #7.