doesn't support upsert-ish behaviour

[robertleeplummerjr]

the following query fails in test, but passes in mysql.

INSERT INTO `user_lauer_testing`
SET `user_id` = '123',
  `username` = 'mike'
ON duplicate KEY
UPDATE `user_id` = '123',
       `username` = 'bob'

[robertleeplummerjr]

#12 fixes this

[Cellule]

I see that #12 has been merged, but hasn't been published to npm yet. Would it be possible for a version bump including this fix please