[Snyk] Upgrade react-dom from 16.6.0 to 16.9.0#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-d8f82232a27cc373afb3c1d102b5ba76

+16-5

Commits on Aug 17, 2019

chore: upgrade react-dom from 16.6.0 to 16.9.0
snyk-test
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