[Snyk] Upgrade mocha from 6.0.2 to 6.2.2#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-f70a1b627efe24f0b43ae52b1c41c173

+264-335

Commits on Apr 9, 2020

fix: upgrade mocha from 6.0.2 to 6.2.2
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