May 20, 2013 Patch

{{Patch layout
 * source2 = http://dev.dota2.com/showthread.php?t=88407
 * source2-title = Issues With The May 20th Update
 * before = 2013-05-17
 * after = 2013-05-21

Update 2

 * Reverted previous update due to issues.

}}