[Snyk] Security upgrade webpack from 2.6.1 to 4.0.0#184

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ed63ff4e1e9e3cbcb710e4baebe3e075

+3,052-606

Commits on Mar 17, 2020

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