fix(deps): update dependency postcss to v7 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
postcss	dependencies	major	^6.0.0 -> ^7.0.0	homepage, source

---

Release Notes

postcss/postcss

### [`v7.0.8`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​708) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.7...7.0.8) - Fix TypeScript definitions (by Ankur Oberoi). - Use `support-colors` 6.0. ### [`v7.0.7`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​707) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.6...7.0.7) - Extend `Error` in `CssSyntaxError`. ### [`v7.0.6`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​706) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.5...7.0.6) - Fix parsing files with BOM (by Veniamin Krol). ### [`v7.0.5`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​705) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.4...7.0.5) - Reduce npm package size (by Gilad Peleg). ### [`v7.0.4`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​704) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.3...7.0.4) - Fix safe parser regression. ### [`v7.0.3`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​703) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.2...7.0.3) - Fix tokenizer extendability (by Andrew Powell). - Reduce npm package size. ### [`v7.0.2`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​702) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.1...7.0.2) - Fix warning text (by Rui Pedro M Lima). ### [`v7.0.1`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​701) [Compare Source](https://togithub.com/postcss/postcss/compare/7.0.0...7.0.1) - Fix JSDoc (by Steven Lambert). ### [`v7.0.0`](https://togithub.com/postcss/postcss/releases/7.0.0) [Compare Source](https://togithub.com/postcss/postcss/compare/6.0.23...7.0.0) PostCSS 7.0 dropped Node.js 4 support and brought small features. #### 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 [Browserslist](https://togithub.com/browserslist/browserslist). Don't worry, PostCSS still generate IE-compatible code. These changes affect websites which run PostCSS on client-side like CodePen. last 2 version not dead not Explorer 11 not ExplorerMobile 11 node 10 node 8 node 6 #### New Features [@​nikhilgaba](https://togithub.com/nikhilgaba) [added](https://togithub.com/postcss/postcss/pull/1093) cute thing for plugin developers. If an error was happened in `Container#walk()` circle, PostCSS will show in stack trace CSS node, which causes this error: TypeError: Cannot read property '0' of undefined at /home/ai/Dev/test/app.css:10:4 at plugin (plugin.js:2:4) at runPostCSS (runner.js:2:1) [@​igorkamyshev](https://togithub.com/igorkamyshev) added `finally` method to `LazyResult` to make it compatible with the latest Promise API. #### Other Changes - Client-side size was reduced by [Size Limit](https://togithub.com/ai/size-limit) feedback. - Add warning on calling PostCSS without plugins and syntax options.

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Disabled by config. Please merge this manually once you are satisfied.

:recycle: Rebasing: Whenever PR becomes conflicted, or if you modify the PR title to begin with "rebase!".

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot. View repository job log here.