[Snyk] Security upgrade webpack from 3.12.0 to 4.0.0#92

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-3efe3b0f13387f32f8b0692e6797f2d7

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Commits on Mar 17, 2020

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