Upping the mongo version requirement
PyMongo 3.6 only supports Mongo 2.6 or higher
@@ -53,7 +53,7 @@ Documentation for MongoDB can be found <a target="_blank" href="http://docs.mong
|-----------|----------------|
| collectd | 4.9 or later |
| Python | 2.4 or later |
-| MongoDB | 2.4 or later |
+| MongoDB | 2.6 or later |
| PyMongo | 3.0 or later |
| Python plugin for collectd | (included with [SignalFx collectd agent](https://github.com/signalfx/integrations/tree/master/collectd)[](sfx_link:sfxcollectd)) |
