[Snyk] Security upgrade webpack-dev-server from 2.9.4 to 3.11.0#89

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d81af8ccb84c1e222ab601fbe7be7cbc

Commits on Jul 8, 2020

fix: burger-builder/package.json & burger-builder/package-lock.json to reduce vulnerabilities
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