[Snyk] Security upgrade mocha from 5.0.4 to 6.0.0#36

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d0fddd125d574cf6a60f111b9dde83f5

+1,985-62

Commits on Mar 30, 2020

fix: test/fixtures/wpt/resources/webidl2/package.json & test/fixtures/wpt/resources/webidl2/package-lock.json to reduce vulnerabilities
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