Update css-loader to the latest version 🚀

[greenkeeper]

Version 0.28.8 of css-loader was just published.

Dependency	css-loader
Current Version	0.28.7
Type	devDependency

The version 0.28.8 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 css-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

v0.28.8

2018-01-05

Bug Fixes

• loader: correctly check if source map is undefined (#641) (0dccfa9)
• proper URL escaping and wrapping (url()) (#627) (8897d44)

Commits

The new version differs by 10 commits.

• 0fc46c7 chore(release): 0.28.8
• 333a2ce chore(package): update dependencies
• 39773aa ci(travis): use npm
• 8897d44 fix: proper URL escaping and wrapping (url()) (#627)
• 0dccfa9 fix(loader): correctly check if source map is undefined (#641)
• d999f4a docs: Update importLoaders documentation (#646)
• 05c36db test: removed redundant modules argument (#599)
• c45fa66 test: add case for url processing (#603)
• 7039740 docs(README): add anchor tags to options table (#609)
• 0840c80 Fix markdown for link to webpack resolve.alias doc (#595)

See the full diff

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