refactor: prepare for v1

[manniL]

Sorry for the long time you waited!

This finally resolves #66

Breaking changes

• postcss mode by default (#15)
• Using PurgeCSS 2 + the new extractor syntax (fn instead of class) (#74, fixes https://github.com/Developmint/nuxt-purgecss/issues/73)
• Unused styles inside SFCs are purged properly
• Enabling the module now depends on the mode by default
  • When in nuxt dev, it is disabled
  • Purging is enabled otherwise

Bug fixes

• Scoped styles are not purged (#75)

Features

• Take nuxt.config.js into account when purging and keep classes set there (fixes https://github.com/Developmint/nuxt-purgecss/issues/82)

Internal improvements

• Improved README (fixes https://github.com/Developmint/nuxt-purgecss/issues/62)
• Revamped tests and utilized https://github.com/nuxt-community/module-test-utils/
• GitHub actions are used as CI now

Thanks

Thanks to all contributors, especially to @simllll!

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@f9942de). Click here to learn what that means. The diff coverage is 0.00%.

@@           Coverage Diff            @@
##             master     #84   +/-   ##
========================================
  Coverage          ?   0.00%           
========================================
  Files             ?       3           
  Lines             ?      59           
  Branches          ?      13           
========================================
  Hits              ?       0           
  Misses            ?      46           
  Partials          ?      13           

Impacted Files	Coverage Δ
lib/logger.js	0.00% <0.00%> (ø)
lib/module.js	0.00% <0.00%> (ø)
lib/utils.js	0.00% <0.00%> (ø)

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