chore(package): update mocha to version 6.1.3

Closes #220

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "eslint-plugin-import": "2.16.0",
     "eslint-plugin-promise": "4.0.1",
     "eslint-plugin-react": "7.12.4",
-    "mocha": "6.0.2",
+    "mocha": "6.1.3",
     "mocha-appveyor-reporter": "0.4.2",
     "mocha-junit-reporter": "1.18.0",
     "mocha-stress": "1.0.0",