[Snyk] Security upgrade mocha from 5.2.0 to 6.2.3

[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:
  • deps/acorn-plugins/acorn-class-fields/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-MINIMIST-559764	Yes	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MOCHA-561476	Yes	No Known Exploit

Commit messages

Package name: mocha

The new version differs by 250 commits.

• eb781e2 Release v6.2.3
• 10dbe94 update CHANGELOG for v6.2.3 [ci skip]
• 848d6fb security: update mkdirp, yargs, yargs-parser
• 843a322 6.2.2
• aec8b02 update CHANGELOG for v6.2.2 [ci skip]
• 7a8b95a npm audit fixes
• cebddf2 Improve reporter documentation for mocha in browser. (module,repl: remove repl require() hack nodejs/node#4026)
• 3f7b987 uncaughtException: report more than one exception per test (deps: upgrade to npm 2.14.12 nodejs/node#4033)
• ee82d38 modify alt text of image from Backers to Sponsors inside Sponsors section in Readme (Investigate flaky test-fs-readfile-tostring-fail nodejs/node#4046)
• e9c036c special-case parsing of "require" in unparseNodeArgs(); closestest: share maxBuffer between stdout and stderr nodejs/node#4035 (npm not found nodejs/node#4063)
• 954cf0b Fix HTMLCollection iteration to make unhide function work as expected (Map: assigning array value in for... of loop not working nodejs/node#4051)
• 816dc27 uncaughtException: fix double EVENT_RUN_END events (doc: add backlog for more server.listen variants nodejs/node#4025)
• 9650d3f add OpenJS Foundation logo to website (test: fix test-domain-with-abort-on-uncaught-exception.js on AIX nodejs/node#4008)
• f04b81d Adopt the OpenJSF Code of Conduct (repl: show exception for out-of-range unicode escape sequence nodejs/node#3971)
• aca8895 Add link checking to docs build step (console.log(not_existing_object) nodejs/node#3972)
• ef6c820 Release v6.2.1
• 9524978 updated CHANGELOG for v6.2.1 [ci skip]
• dfdb8b3 Update yargs to v13.3.0 (tools: add preinstall script for npm on OS X nodejs/node#3986)
• 18ad1c1 treat '--require esm' as Node option (benchmark should be executed in "strict mode" nodejs/node#3983)
• fcffd5a Update yargs-unparser to v1.6.0 (EMFILE error appears in iojs v1.2.0 on Windows nodejs/node#3984)
• ad4860e Remove extraGlobals() (JSStream ReadStream Assertion Failure nodejs/node#3970)
• b269ad0 Clarify effect of .skip() (Do not send empty TCP packet in _http_outgoing.js nodejs/node#3947)
• 1e6cf3b Add Matomo to website (doc: repl: add defineComand and displayPrompt nodejs/node#3765)
• 91b3a54 fix style on mochajs.org (Investigate test-cluster-worker-isdead.js failure nodejs/node#3886)

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