.travis.yml in authpwn_rails-0.20.0 vs .travis.yml in authpwn_rails-0.21.0

@@ -1,6 +1,8 @@
 sudo: false
 language: ruby
+services:
+  - postgresql
 addons:
   postgresql: "9.4"
 env:
   - DB=mysql:utf8_general_ci
   - DB=mysql:utf8_bin