chore(package): update mocha to version 6.1.3

Closes #41

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
 		"express": "^4.16.3",
 		"husky": "^0.14.3",
 		"lint-staged": "^7.0.4",
-		"mocha": "^5.1.1",
+		"mocha": "^6.1.3",
 		"strip-ansi": "^4.0.0",
 		"supertest": "^3.0.0"
 	},