Update postcss-loader to the latest version 🚀

[greenkeeper]

Version 3.0.0 of postcss-loader was just published.

Dependency	postcss-loader
Current Version	2.1.6
Type	dependency

The version 3.0.0 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of postcss-loader.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Release Notes

v3.0.0

2018-08-08

Bug Fixes

• index: add ast version (meta.ast) (f34954f)
• index: emit warnings as an instance of {Error} (8ac6fb5)
• options: improved ValidationError messages (549ea08)

Chores

• package: update postcss v6.0.0...7.0.0 (dependencies) (#375) (daa0da8)

BREAKING CHANGES

• package: requires node >= v6.0.0

Commits

The new version differs by 27 commits.

• 7647ac9 chore(release): 3.0.0
• 313c3c4 docs(README): update filename formatting
• d6931da refactor(Error): add error property checks
• 962b1d6 refactor(options): remove ident from validation schema
• 1f98aee refactor(Warning): add warning property checks
• 95de4c1 docs(LOADER): update JSDoc
• ea68a42 chore(package): update schema-utils v0.4.5...1.0.0 (dependencies)
• 73a8c66 chore(ISSUE_TEMPLATE/DOCS): add template for documentation issues
• 70f4426 chore(ISSUE_TEMPLATE/FEATURE): add feature request template
• 4a0328e chore(ISSUE_TEMPLATE/BUG): move bug reports into their own template
• 319d1f7 chore(PULL_REQUEST_TEMPLATE): improve format and content
• bdcbef0 refactor(src): update code base with latest ES2015+ features
• f34954f fix(index): add ast version (meta.ast)
• 8ac6fb5 fix(index): emit warnings as an instance of {Error}
• 2c6033b test(Errors): remove stacktrace from snapshot

There are 27 commits in total.

See the full diff

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