chore(package): update mocha to version 6.2.1

Closes #3

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-react": "^7.4.0",
-    "mocha": "^5.2.0",
+    "mocha": "^6.2.1",
     "mocha-lcov-reporter": "^1.3.0",
     "nyc": "^13.1.0"
   },