chore(deps): update dependency postcss to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
postcss	devDependencies	major	^6.0.23 -> ^7.0.0	homepage, source

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Release Notes

postcss/postcss

v7.0.14

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• Fix tokenizer for postcss-less (by Matt Lyons).

v7.0.13

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• Fix parsing regression in 7.0.12 for comments between property and value.

v7.0.12

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• Fix parsing broken CSS with two words in declaration property.

v7.0.11

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• Fix source maps on declaration semicolon (by Niklas Mischkulnig).

v7.0.10

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• Fix source maps (by Niklas Mischkulnig).

v7.0.9

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• Increase stringifing performance for non-raws AST.

v7.0.8

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• Fix TypeScript definitions (by Ankur Oberoi).
• Use support-colors 6.0.

v7.0.7

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• Extend Error in CssSyntaxError.

v7.0.6

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• Fix parsing files with BOM (by Veniamin Krol).

v7.0.5

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• Reduce npm package size (by Gilad Peleg).

v7.0.4

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• Fix safe parser regression.

v7.0.3

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• Fix tokenizer extendability (by Andrew Powell).
• Reduce npm package size.

v7.0.2

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• Fix warning text (by Rui Pedro M Lima).

v7.0.1

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• Fix tokenizer for postcss-less (by Matt Lyons).

v7.0.0

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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. 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 added 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 added finally method to LazyResult to make it compatible with the latest Promise API.

Other Changes

• Client-side size was reduced by Size Limit feedback.
• Add warning on calling PostCSS without plugins and syntax options.

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