chore(package): update mocha to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.3",
-    "mocha": "^4.0.0",
+    "mocha": "^5.0.0",
     "rollup": "^0.51.0",
     "rollup-plugin-babel": "^3.0.0",
     "rollup-plugin-commonjs": "^8.0.2",