Bump mocha from 4.0.1 to 6.2.0 (#18)

Bumps [mocha](https://github.com/mochajs/mocha) from 4.0.1 to 6.2.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v4.0.1...v6.2.0)

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

Author: dependabot-preview[bot]

package.json

@@ -41,7 +41,7 @@
     "escope": "^3.6.0",
     "eslint": "^6.1.0",
     "eslint-config-trigen": "^2.3.1",
-    "mocha": "^4.0.1",
+    "mocha": "^6.2.0",
     "nyc": "^11.4.1",
     "rollup": "^0.53.0",
     "rollup-plugin-babel": "^3.0.3",