tute/merit — pull request #195 by paulopatto (2014-09-24 21:16:37+00:00)
Title: [change_migrations_to_use_change_method] Change method ActiveRecord::Migration :up/:down to use :change.

As described in https://github.com/bbatsov/rails-style-guide#migrations.
- http://api.rubyonrails.org/v3.2.0/classes/ActiveRecord/Migration.html#Revesible+Migrations