[Snyk] Security upgrade postcss-cli from 6.0.0 to 8.0.0#24

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snyk-bot wants to merge 1 commit intov4-devfrom snyk-fix-ca4f304a40fae18e7dc83eba6f9f40bc

+594-107

Commits on Nov 17, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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