chore(deps): update dependency mocha to v6.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	6.2.0 -> 6.2.1

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Release Notes

mochajs/mocha

v6.2.1

Compare Source

🐛 Fixes

• #​3955: tty.getWindowSize is not a function inside a "worker_threads" worker (@​1999)
• #​3970: remove extraGlobals() (@​juergba)
• #​3984: Update yargs-unparser to v1.6.0 (@​juergba)
• #​3983: Package 'esm': spawn child-process for correct loading (@​juergba)
• #​3986: Update yargs to v13.3.0 and yargs-parser to v13.1.1 (@​juergba)

📖 Documentation

• #​3886: fix styles on mochajs.org (@​outsideris)
• #​3966: Remove jsdoc index.html placeholder from eleventy file structure and fix broken link in jsdoc tutorial (@​Munter)
• #​3765: Add Matomo to website (@​MarioDiaz98)
• #​3947: Clarify effect of .skip() (@​oliversalzburg)

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[coveralls]

Coverage remained the same at 100.0% when pulling 0025bf9 on renovate/mocha-6.x into c262993 on master.