Revert "Merge pull request #596 from oauthjs/renovate/mocha-7.x"

This reverts commit cb2bb88, reversing
changes made to 6997303.

Author: thomseddon

package.json

@@ -45,7 +45,7 @@
   },
   "devDependencies": {
     "jshint": "2.11.1",
-    "mocha": "7.2.0",
+    "mocha": "3.5.3",
     "should": "13.2.3",
     "sinon": "9.0.2"
   },