[Snyk] Security upgrade webpack-dev-server from 2.11.2 to 3.1.6#22

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-aadba53262db2a475640fba56c11c8e3

+1-1

Commits on Dec 2, 2020

fix: package.json to reduce vulnerabilities
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