Add info about `deferred.notify` and example.
Add info about `deferred.notify` and example.

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