chore(package): upgrade to postcss
v6.0.0 && cssnano
v4.0.0-rc.2
#654
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What kind of change does this PR introduce?
Dependency upgrade
Did you add tests for your changes?
N/A
If relevant, did you update the README?
N/A
Summary
Upgraded to PostCSS 6/cssnano 4: Fixes #535
Does this PR introduce a breaking change?
As cssnano has multiple breaking changes, old configurations may not work.
Other information
Blocked by: cssnano 4 release(cssnano/cssnano#408)
Meanwhile you can use
github:ylemkimon/css-loader
as dependency.