[Snyk] Upgrade core-js from 2.6.5 to 2.6.9#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-c8b9043dbbd64aecbddb2e73e4519053

+41-16

Commits on Sep 5, 2019

chore: upgrade core-js from 2.6.5 to 2.6.9
snyk-test
committed