chore(package): update mocha to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
         "clean-webpack-plugin": "^0.1.19",
         "copy-webpack-plugin": "^4.5.2",
         "glob": "^7.1.2",
-        "mocha": "^5.2.0",
+        "mocha": "^6.0.0",
         "supertest": "^3.1.0",
         "ts-loader": "^4.4.2",
         "typescript": "^3.0.1",