[Snyk] Upgrade mini-css-extract-plugin from 0.6.0 to 0.9.0#13

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-ce8cca4ff77c78676a01f541ba306476

+51-46

Commits on Mar 26, 2020

fix: upgrade mini-css-extract-plugin from 0.6.0 to 0.9.0
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