[Snyk-local] Security upgrade react-scripts from 1.1.5 to 3.0.0#31

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snyk-fix-46ee248dd5a38e2c81fdf76e337db1ca

Commits on Aug 4, 2020

fix: exercises/1-react/package.json, exercises/1-react/package-lock.json & exercises/1-react/.snyk to reduce vulnerabilities
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