First we must spawn a villager in a small area. Then we must take a zombie egg and spawn it very close to the villager. We must do it till, the villager gets beaten by the zombie. And at last the villager will be killed. All this must be MADE IN PEACEFUL MODE. We must spawn the egg of zombie without stoping. I dont know if this bug works on other versions, but I think YES.

Hope it helped. 

In game nickname - Sally316