Revert back README changes as they can't be displayed as lon as AHC2 is not released
Revert back README changes as they can't be displayed as lon as AHC2 is not released

liuyb02/async-http-client,stepancheg/async-http-client,ooon/async-http-client,Aulust/async-http-client,elijah513/async-http-client,hgl888/async-http-client,olksdr/async-http-client,ALEXGUOQ/async-http-client,magiccao/async-http-client,dotta/async-http-client,drmaas/async-http-client,bomgar/async-http-client,fengshao0907/async-http-client,junjiemars/async-http-client,thinker-fang/async-http-client,craigwblake/async-http-client-1,wyyl1/async-http-client,jxauchengchao/async-http-client,afelisatti/async-http-client,nemoyixin/async-http-client,Aulust/async-http-client