When Did This Happen?

So, I rolled up a Pally for quick adventure and was fighting couple of skeletons.  I was losing but still in the fight and it dawned on me that I should be able to turn the undead.  So I looked in the 5 edition player manual rules and found nothing.  But on page 22 of my Player's manual, that was printed in 1978, it said that at level 3 I was about to effect the undead, demons, and devils. Poor me I was only level 1.   So when did this change happened and why still can't we effect the undead, demons, and devils?