fix podspec
fix podspec

0xced/SignalR-ObjC,keyclipse/SignalR-ObjC,SportsLock/SignalR-ObjC,ivasic/SignalR-ObjC,vamsirajendra/SignalR-ObjC,DyKnow/SignalR-ObjC,wonderxboy/SignalR-ObjC,benhongh/SignalR-ObjC,benhongh/SignalR-ObjC,0xced/SignalR-ObjC,vamsirajendra/SignalR-ObjC,SimplifydigitalLtd/SignalR-ObjC,SimplifydigitalLtd/SignalR-ObjC