Update mini-css-extract-plugin to the latest version 🚀

The devDependency mini-css-extract-plugin was updated from `0.6.0` to `0.7.0`.

This version 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.

Release Notes for v0.7.0

0.7.0 (2019-05-27)

Bug Fixes

do not attempt to reload unrequestable urls (#378) (44d00ea)
fix publicPath regression (#384) (582ebfe)
enable using plugin without defining options (#393) (a7dee8c)
downgrading normalize-url (#399) (0dafaf6)
hmr do not crash on link without href (#400) (aa9b541)
hmr reload with invalid link url (#402) (30a19b0)

Features

add moduleFilename option (#381) (13e9cbf)

Commits

The new version differs by 12 commits.

392c4ae chore(release): 0.7.0
30a19b0 fix: hmr reload with invalid link url (#402)
ee9df43 chore: add test manual script (#401)
aa9b541 fix: hmr do not crash on link without href (#400)
0dafaf6 fix: downgrading normalize-url (#399)
582ebfe fix(loader): fix publicPath regression (#384)
f3a6dba refactor: use babel for compiling client code (#396)
7d022b3 chore(defaults): update (#395)
a7dee8c fix(options): enable using plugin without defining options (#393)
13e9cbf feat(options): add moduleFilename option (#381)
b0a0355 perf: match filename placeholders with regular expression (#383)
44d00ea fix: do not attempt to reload unrequestable urls (#378)

See the full diff

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