Migrates adding limit to username and removing Comment.title

db/migrate/20150909131133_set_username_limit.rb

@@ -0,0 +1,5 @@
+class SetUsernameLimit < ActiveRecord::Migration
+  def change
+    change_column :users, :username, :string, limit: 200
+  end
+end

db/migrate/20150909135032_remove_comment_title.rb

@@ -0,0 +1,5 @@
+class RemoveCommentTitle < ActiveRecord::Migration
+  def change
+    remove_column :comments, :title
+  end
+end