[Snyk] Upgrade core-js from 2.5.3 to 2.6.11#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-c58cd02a34651660dc16dfd13e2f1a70

+99-31

Commits on Feb 6, 2020

fix: upgrade core-js from 2.5.3 to 2.6.11
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