Bump mocha from 5.2.0 to 6.1.4

Bumps [mocha](https://github.com/mochajs/mocha) from 5.2.0 to 6.1.4.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v5.2.0...v6.1.4)

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

package.json

@@ -9,7 +9,7 @@
   "author": "Nemo <me@captnemo.in>",
   "license": "MIT",
   "devDependencies": {
-    "mocha": "^5.2.0"
+    "mocha": "^6.1.4"
   },
   "dependencies": {
     "console-log-level": "^1.4.1",