Update serializers.md

Quintasan · Quintasan · commit dcc7af925d68 · 2016-04-11T14:52:07.000+02:00
diff --git a/docs/general/serializers.md b/docs/general/serializers.md
@@ -78,7 +78,7 @@ def cached_blog
 end
 ```
 
-``ruby
+```ruby
 has_one :blog, if: :show_blog?
 
 def show_blog?
