Bump mocha from 6.2.0 to 6.2.1

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/v6.2.1/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.0...v6.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -43,7 +43,7 @@
     "chai": "^4.2.0",
     "coveralls": "^3.0.5",
     "del-cli": "^3.0.0",
-    "mocha": "^6.2.0",
+    "mocha": "^6.2.1",
     "nyc": "^14.1.1",
     "remark-cli": "^7.0.0",
     "remark-preset-lint-recommended": "^3.0.2",