[Snyk] Upgrade core-js from 3.4.8 to 3.6.4#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-4bc975bdadad2f0c34543ef1ba1ff2d1

+4-4

Commits on Mar 16, 2020

fix: upgrade core-js from 3.4.8 to 3.6.4
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