Merge pull request #226 from ZeusWPI/dependabot/bundler/pg-1.5.6

Bump pg from 1.5.5 to 1.5.6

Author: chvp

Gemfile.lock

@@ -199,7 +199,7 @@ GEM
     parser (3.3.0.4)
       ast (~> 2.4.1)
       racc
-    pg (1.5.5)
+    pg (1.5.6)
     psych (5.1.2)
       stringio
     public_suffix (5.0.4)