[Snyk] Upgrade core-js from 3.6.1 to 3.6.3#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-85b5897741d2eb787e6763c20ac459a7

+4-4

Commits on Jan 19, 2020

fix: upgrade core-js from 3.6.1 to 3.6.3
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