[Snyk] Security upgrade react-scripts from 1.1.4 to 3.4.2#100

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d440a5222ef2d2bd7f2ffe398baf6ba5

Commits on Aug 12, 2020

fix: CompletedSections/redux--01-start/package.json & CompletedSections/redux--01-start/package-lock.json to reduce vulnerabilities
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