chore(package): update mocha to version 7.0.1

Closes #6

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "expect.js": "^0.3.1",
-    "mocha": "^3.2.0"
+    "mocha": "^7.0.1"
   },
   "scripts": {
     "test": "mocha"