chore(package): update mocha to version 5.0.0

Closes #47

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "enzyme": "^2.9.1",
     "express": "^4.15.3",
     "jest": "^20.0.4",
-    "mocha": "^3.4.2",
+    "mocha": "^5.0.0",
     "peer-tester": "^1.0.6",
     "react": "^15.6.1",
     "react-dom": "^15.6.1",