[Snyk] Security upgrade postcss-cli from 6.1.3 to 8.0.0#10

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-50aed61db7ee2ba2ba0f83ddc32b69ef

+2,184-169

Commits on Nov 27, 2020

fix: package.json, yarn.lock & .snyk to reduce vulnerabilities
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