[Snyk] Security upgrade mocha from 2.5.3 to 7.1.1#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-eff2e3b2d090655b370213ce44990dd5

+851-94

Commits on Mar 19, 2020

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