Update dependency mini-css-extract-plugin to v0.8.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	devDependencies	minor	0.5.0 -> 0.8.0

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Release Notes

webpack-contrib/mini-css-extract-plugin

v0.8.0

Compare Source

Features

• Add ignoreOrder option (#​422) (4ad3373)

v0.7.0

Compare Source

Features

• Add ignoreOrder option (#​422) (4ad3373)

v0.6.0

Compare Source

Features

• added error code to chunk load Error (#​347) (b653641)
• adding hot module reloading (#​334) (4ed9c5a)
• publicPath can be a function (#​373) (7b1425a)

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