chore(deps-dev): bump mocha from 5.2.0 to 6.2.2

Bumps [mocha](https://github.com/mochajs/mocha) from 5.2.0 to 6.2.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v5.2.0...v6.2.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -156,7 +156,7 @@
     "istanbul": "^1.1.0-alpha.1",
     "jsdom": "^14.0.0",
     "jsdom-global": "^3.0.2",
-    "mocha": "^5.2.0",
+    "mocha": "^6.2.2",
     "omit-deep-lodash": "^1.1.4",
     "prettier": "^1.16.4",
     "shx": "^0.3.2",