[Snyk] Security upgrade mocha from 5.2.0 to 6.0.0#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-33b851f17e74f35a63fe6d63ffbef7cc

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Commits on Mar 30, 2020

fix: deps/acorn-plugins/acorn-private-class-elements/package.json to reduce vulnerabilities
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