Bump mocha from 5.2.0 to 6.1.1

Bumps [mocha](https://github.com/mochajs/mocha) from 5.2.0 to 6.1.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v5.2.0...v6.1.1)

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

Author: dependabot-support

package.json

@@ -17,7 +17,7 @@
     "espower-loader": "^1.0.0",
     "fixturify": "^1.0.1",
     "jscodeshift": "^0.3.30",
-    "mocha": "^5.1.0",
+    "mocha": "^6.1.1",
     "mocha-eslint": "^3.0.1",
     "power-assert": "^1.3.1",
     "rimraf": "^2.5.2"