Merge pull request #24 from shinyaK14/fix_readme

Fix 1:Many example in README.md

README.md

@@ -295,7 +295,7 @@ end
 For batches where the value is some kind of collection, such as an Array or Hash, `loader` also supports being called with a block, which yields the _current_ value, and returns the _next_ value. This is extremely useful for 1:Many relationships:
 
 ```ruby
-BatchLoader.for(user.id).batch(default_value: []) do |comment_ids, loader|
+BatchLoader.for(user.id).batch(default_value: []) do |user_ids, loader|
   Comment.where(user_id: user_ids).each do |comment|
     loader.call(comment.user_id) { |memo| memo << comment }
   end