Update demos link in readme
Update demos link in readme

Masadow/ngInfiniteScroll,emmafaye/ngInfiniteScroll-PureJS,uzen/angular-infinitescroll,uzen/angular-infinitescroll,timesqueezer/ngInfiniteScroll,itkin/ngInfiniteScroll,xuwupeng2000/ngInfiniteScroll,sroze/ngInfiniteScroll,Manumental32/ngInfiniteScroll,hlsolutions/ngInfiniteScroll,msbit/ngInfiniteScroll,sroze/ngInfiniteScroll,AmitThakkar/ngInfiniteScroll,solomon87/ngInfiniteScroll,yesmeck/ngInfiniteScroll,just-boris/ngInfiniteScroll,maxamillion32/ngInfiniteScroll,tianyawy/ngInfiniteScroll,seawenzhu/ngInfiniteScroll,maksimr/ngInfiniteScroll,Tradiio/ngInfiniteScroll,cloudnode-app/ngInfiniteScroll,suryasingh/ngInfiniteScroll,aisharagheb/ngInfiniteScroll