fix(pkg.json): update mocha

Author: pine

package.json

@@ -28,7 +28,7 @@
     "karma-sauce-launcher": "^1.2.0",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^2.0.6",
-    "mocha": "^4.0.1",
+    "mocha": "^5.0.0",
     "npm-run-all": "^4.1.2",
     "text-encoding": "^0.6.0",
     "webpack": "^3.10.0"