[Snyk] Security upgrade mocha from 2.5.3 to 6.0.0#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-279e17a970fe5a97d11d9249cad43af3

+2,020-101

Commits on Mar 30, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
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