Document 140 character limitation removal for Direct Messages [ci skip]
Document 140 character limitation removal for Direct Messages [ci skip]

see:
https://twittercommunity.com/t/removing-the-140-character-limit-from-direct-messages/41348

creeshla/ruby-twitter,dantame/twitter,kevinmel2000/twitter,stkn417/twitter,ariarijp/twitter,develon/twitter,paulgonz6/twitter,mike-north/twitter,SophieDeBenedetto/twitter,kmcmcurtis7/twitter,megashurik/twitter,roschaefer/twitter