chore(package): update mocha to version 7.1.1

Closes #57

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "benchmark": "^2.1.0",
     "coveralls": "^2.13.3",
     "nyc": "^14.1.1",
-    "mocha": "^6.1.1",
+    "mocha": "^7.1.1",
     "standard": "^11.0.1"
   },
   "author": "Ruben Bridgewater",