merged version-match fix for Replset.py

Author: Tim Vaillancourt

MongoBackup/Replset.py

@@ -36,7 +36,7 @@ def get_rs_status(self):
 
     def get_rs_config(self):
         try:
-            if self.db.server_version() >= tuple("2.6.0".split(".")):
+            if self.db.server_version() >= tuple("3.0.0".split(".")):
                 output = self.db.admin_command('replSetGetConfig')
                 return output['config']
             else: