simplify contributor report

app/logical/reports/contributors.rb

@@ -3,7 +3,7 @@ require 'statistics2'
 module Reports
   class Contributors < User
     def users
-      ::User.where("users.level >= ? and users.post_upload_count >= 250", ::User::Levels::CONTRIBUTOR).order("created_at desc").limit(50).map {|x| Reports::UserPromotions::User.new(x)}
+      ::User.where("users.level >= ? and users.post_upload_count >= 250", ::User::Levels::CONTRIBUTOR).order("created_at desc").map {|x| Reports::UserPromotions::User.new(x)}
     end
   end
 end