changed my mind about pg gem

Gemfile

@@ -20,6 +20,6 @@ end
 
 # bundle install --without test --without development
 group :production do
-  # uncomment to use postgres in production, or move outside a group if your app uses postgres for development and production 
-  # gem 'pg'
+  # use postgres in production, or move outside a group if your app uses postgres for development and production 
+  gem 'pg'
 end

Gemfile.lock

@@ -24,6 +24,7 @@ GEM
     method_source (0.8.2)
     minitest (5.8.3)
     multi_json (1.11.2)
+    pg (0.18.4)
     pry (0.10.3)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
@@ -76,6 +77,7 @@ PLATFORMS
 
 DEPENDENCIES
   activesupport
+  pg
   pry
   puma
   rake