[Snyk] Security upgrade mocha from 5.2.0 to 6.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MOCHA-561476	Yes	No Known Exploit

Commit messages

Package name: mocha

The new version differs by 209 commits.

• 42303e2 Release v6.0.0
• a553ca7 punctuation updates for changelog v6.0.0
• c710792 grammar updates for changelog v6.0.0
• 9f9293a update changelog for v6.0.0
• a540eb0 remove "projects" section from MAINTAINERS.md [ci skip]
• 52b5c42 Uppercased JSON reporter name in `describe` title (#3739)
• 82307fb Fix `.globals` to remove falsy values (#3737)
• 56dc28e Remove unnecessary post-processing code having no effect; closes #3708 (#3733)
• 16b4281 Documentation updates (#3728)
• 5d9d3eb Update nyc
• 118c9ae Refactor out usages of Suite#_onlyTests and Suite#_onlyTests (#3689) (#3707)
• 0dacd1f Add ability to unload files from `require` cache (redux) (#3726)
• 66a52f2 update release steps [ci skip]
• 45ae014 Refactor `lookupFiles` and `files` (#3722)
• 94c9320 fix --reporter-option to allow comma-separated options; closes #3706
• 0f546fc Refactor checkGlobals() error message creation (#3711)
• 2d21fd6 add missing user reference in CHANGELOG.md [ci skip]
• 6cb4e27 add all changes since v6.0.0-1 to CHANGELOG.md [ci skip]
• 186ca36 add createInvalidArgumentError(); see #3676 (#3677)
• 3a7fa37 Revert 00ca06b0e957ec4f067268c98053782ac5dcb69f; closes #3414 (#3715)
• 21ba5ce fix --inspect and its ilk; closes #3681 (#3699)
• 52b9a5f refactor: use constants for event names instead of string literals
• 29aa611 Eliminated variable shadowing from test event listeners (runner.spec.js) (#3712)
• e01a54e update usage info in docs [ci skip]

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