Fix update counters of multiple records with touch: true

Currently does not work the following example in the doc:

```ruby
  # For the Posts with id of 10 and 15, increment the comment_count by 1
  # and update the updated_at value for each counter.
  Post.update_counters [10, 15], comment_count: 1, touch: true
  # Executes the following SQL:
  # UPDATE posts
  #    SET comment_count = COALESCE(comment_count, 0) + 1,
  #    `updated_at` = '2016-10-13T09:59:23-05:00'
  #  WHERE id IN (10, 15)
```

0 files changed, 0 insertions, 0 deletions