fix image URL, update README
fix image URL, update README

iOS--wsl--victor/Shimmer,suchitabohra/Shimmer,liuzechen/Shimmer,zdiovo/Shimmer,Kevin775263419/Shimmer,yang7229693/Shimmer,godLoveLucifer/Shimmer,SuPair/Shimmer,xb123456456/Shimmer,takeshineshiro/Shimmer,freebird999/Shimmer,gank0326/shimmer,iOSTestApps/Shimmer,1yvT0s/Shimmer,ernestopino/Shimmer,dinhchitrung/Shimmer,Suninus/Shimmer,tuanpa199/Shimmer,kingloveyy/Shimmer,toughie88/Shimmer,bangslosan/Shimmer,moneytree/Shimmer,HarrisLee/Shimmer,AlanJN/Shimmer