Updated Readme with Sina Weibo provider
Updated Readme with Sina Weibo provider

adamjmcgrath/SimpleAuth-1,tofaruk/SimpleAuth-1,tipbit/SimpleAuth,machelix/SimpleAuth,AlexanderMazaletskiy/SimpleAuth,sburavtsov/SimpleAuth,jiakai-lian/SimpleAuth,martinpilch/SimpleAuth,hoanganh6491/SimpleAuth,calebd/SimpleAuth,hyperspacemark/SimpleAuth