[Snyk] Security upgrade webpack from 3.10.0 to 4.0.0#402

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snyk-fix-343c7c649df71d368826c3a12d0b3d16

Commits on Mar 17, 2020

fix: demos/multi-use-existing-angular5/package.json & demos/multi-use-existing-angular5/package-lock.json to reduce vulnerabilities
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