[Snyk] Upgrade react-dom from 16.4.2 to 16.12.0#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-52675c2d6c8b8b8516351b23d8a4a6bc

+47-19

Commits on Feb 9, 2020

fix: upgrade react-dom from 16.4.2 to 16.12.0
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