445 Main and AtRule to use new PostCSS Syntax

[peterramsing]

What kind of change is this? (Bug Fix, Feature...)

What is the current behavior (You can also link to an issue)

What is the new behavior this introduces (if any)

Does this introduce any breaking changes?

Does the PR fulfill these requirements?

• Tests for the changes have been added
• Docs have been added or updated

Other Comments

[codecov]

Codecov Report

Merging #446 (979eacf) into master (2f09e0a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #446   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines          775       776    +1     
=========================================
+ Hits           775       776    +1     

Impacted Files	Coverage Δ
lib/lost-at-rule.js	100.00% <100.00%> (ø)
lost.js	100.00% <100.00%> (ø)

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[ThornWalli]

@peterramsing What is the current status here? The priority of postcss update becomes more and more importance...

Get this message when using this plugin, update of postcss-preset-env results in incompatibility.

[peterramsing]

Look into getting this releases asap.

[peterramsing]

All tests are passing and other issues seem to be resolved with this PR. I'm not ready to release a non-beta version of v8 but this PR seems buttoned up.