Add Promises/A+ logo to readme.
Add Promises/A+ logo to readme.

criferlo/q,ShopCo/q,signpost/q,welbornio/q,rasata/q,signpost/q,aramk/q,harks198913/q,yizziy/q,dracher/q,ShopCo/q,rasata/q,gustavobeavis/q,potato620/q,X-Bird/q,dracher/q,bnicart/q,Zeratul5/q,b12consulting/q,lidasong2014/q,manushthinkster/q,potato620/q,kriskowal/q,cgvarela/q,miamarti/q,manushthinkster/q,mcanthony/q,pwmckenna/q,npmcomponent/microjs-q,behind2/q,pwmckenna/q,CozyCo/q,X-Bird/q,SarunasAzna/q,100star/q,gustavobeavis/q,IlianStefanov/q,homer0/q,lvdou2518/q,greyhwndz/q,ajunflying/q,darkdragon-001/q,jymsy/q,CozyCo/q,criferlo/q,kriskowal/q,kevinsawicki/q,yizziy/q,cgvarela/q,behind2/q,liwangbest/q,lidasong2014/q,bnicart/q,ajunflying/q,aramk/q,zhangwenquan/q,npmcomponent/techjacker-q,liwangbest/q,homer0/q,SarunasAzna/q,IbpTeam/node-q,gorcz/q,gorcz/q,linalu1/q,welbornio/q,greyhwndz/q,zhangwenquan/q,harks198913/q,lvdou2518/q,darkdragon-001/q,IbpTeam/node-q,linalu1/q,willsmth/q,Muffasa/q,jymsy/q,mcanthony/q,miamarti/q,IlianStefanov/q,Muffasa/q,STRd6/q,b12consulting/q,willsmth/q,Zeratul5/q