revert mocha because newer versions don't run on node versions this old

Author: mreinstein

package-lock.json

@@ -31,7 +31,7 @@
   },
   "devDependencies": {
     "browserify": "^16.5.2",
-    "mocha": "^8.3.2",
+    "mocha": "^5.2.0",
     "multiline": "^1.0.2",
     "zuul": "3.10.1"
   },