[Snyk] Upgrade core-js from 2.5.0 to 2.6.11#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-f876988db1c5d43884c389c7481a71d7

+115-45

Commits on Jul 2, 2020

fix: upgrade core-js from 2.5.0 to 2.6.11
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