Merge pull request #231 from tuanle03/dependabot/bundler/pg-1.5.9

Bump pg from 1.5.8 to 1.5.9

Author: tuanle03

Gemfile.lock

@@ -233,7 +233,7 @@ GEM
     parser (3.3.5.0)
       ast (~> 2.4.1)
       racc
-    pg (1.5.8)
+    pg (1.5.9)
     psych (5.1.2)
       stringio
     public_suffix (5.0.4)