Updated README for POST method
Updated README for POST method

going/requests,QuentinPerez/gorequest,roth1002/gorequest,julianshen/gorequest,rockneurotiko/gorequest,jqs7/gorequest,csrgxtu/gorequest,parnurzeal/gorequest,fromkeith/gorequest,vicanso/gorequest,kemadz/gorequest