chore(package): update mocha to version 7.1.0

Closes #33

Author: greenkeeper[bot]

package.json

@@ -36,6 +36,6 @@
     "@types/mocha": "5.2.6",
     "chai": "4.1.2",
     "lodash": "4.17.15",
-    "mocha": "6.1.4"
+    "mocha": "7.1.0"
   }
 }