bump mongojs to 2.4

services/notifications/package.json

@@ -13,7 +13,7 @@
     "express": "3.1.0",
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#v1.1.0",
     "metrics-sharelatex": "git+https://github.com/sharelatex/metrics-sharelatex.git#v1.3.0",
-    "mongojs": "1.4.1",
+    "mongojs": "^2.4.0",
     "node-statsd": "0.0.3",
     "request": "^2.65.0",
     "settings-sharelatex": "git+https://github.com/sharelatex/settings-sharelatex.git#v1.0.0",