Remove the added deprecation logic
Remove the added deprecation logic

We're jumping major versions anyway, so it's not a requirement, and I'd rather not support temporary code.

hason/commonmark,fesor/commonmark,stof/commonmark,garethellis36/commonmark,fesor/commonmark,kkiernan/commonmark,colinodell/commonmark,thephpleague/commonmark,hason/commonmark,postalservice14/commonmark,garethellis36/commonmark,postalservice14/commonmark,bcremer/commonmark,thephpleague/commonmark,kkiernan/commonmark