Set postgres version for Travis to 9.3
Set postgres version for Travis to 9.3

MSP-12540

farias-r7/metasploit_data_models,farias-r7/metasploit_data_models,rapid7/metasploit_data_models,bcook-r7/metasploit_data_models,rapid7/metasploit_data_models,bcook-r7/metasploit_data_models,bcook-r7/metasploit_data_models,rapid7/metasploit_data_models,farias-r7/metasploit_data_models