Kill trailing whitespace in ruby files

app/logical/post_search_context.rb

@@ -1,14 +1,14 @@
 class PostSearchContext
   attr_reader :params, :post_id
-  
+
   def initialize(params)
     @params = params
     raise unless params[:seq].present?
     raise unless params[:id].present?
-    
+
     @post_id = find_post_id
   end
-  
+
   def find_post_id
     if params[:seq] == "prev"
       post = Post.tag_match(params[:tags]).where("posts.id > ?", params[:id].to_i).reorder("posts.id asc").first