Merge pull request #1089 from eikes/improve_ransackable_scopes_skip_sanitize_args_docs

Improves ransackable_scopes_skip_sanitize_args doc

Author: scarroll32

README.md

@@ -757,7 +757,7 @@ To turn this off on a per-scope basis Ransack adds the following method to
 Add the scope you wish to bypass this behavior to ransackable_scopes_skip_sanitize_args:
 
 ```ruby
-def ransackable_scopes_skip_sanitize_args
+def self.ransackable_scopes_skip_sanitize_args
   [:scope_to_skip_sanitize_args]
 end
 ```