[Snyk] Upgrade core-js from 3.2.1 to 3.4.3#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-e20fbeee2ea8cf09196f3b366df1b212

+4-4

Commits on Dec 5, 2019

fix: upgrade core-js from 3.2.1 to 3.4.3
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