[Snyk] Upgrade mocha from 2.5.3 to 6.2.2#5

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-009d89af12a64b3b4650773c87c47dac

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Commits on Oct 27, 2019

chore: upgrade mocha from 2.5.3 to 6.2.2
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