Update mocha

Author: lukemelia

package.json

@@ -34,7 +34,7 @@
     "github": "^0.2.4",
     "glob": "^7.1.1",
     "loader.js": "^4.7.0",
-    "mocha": "^3.2.0",
+    "mocha": "^6.2.0",
     "multiline": "^1.0.2"
   },
   "keywords": [