[Snyk] Security upgrade webpack from 2.7.0 to 4.0.0#21

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a292d84ed5e3a2b432add7228eef1cbb

+1-1

Commits on Mar 17, 2020

fix: app/react-native/package.json to reduce vulnerabilities
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