Bump MDM ver to get pro and msf back in sync.

Per discussion with @dmaloney-r7

Author: pbarry-r7

Gemfile.lock

@@ -168,7 +168,7 @@ GEM
       activesupport (~> 4.2.6)
       railties (~> 4.2.6)
     metasploit-payloads (1.1.16)
-    metasploit_data_models (2.0.1)
+    metasploit_data_models (2.0.4)
       activerecord (~> 4.2.6)
       activesupport (~> 4.2.6)
       arel-helpers