RFR

Not perfect.... Let me know how it is though!! :)
This can't be rolled back & forward properly.  If you rollback, you'll have removed the `likes_count` column.  Then when you try to migrate forward again, you won't be able to remove the `likes_count` column b/c it no longer exists.

Instead, you can use the `change_column` method:

```ruby
def up
  change_column :reviews, :likes_count, :integer, default: 0
end

def down
  change_column :reviews, :likes_count, :integer
end
```