Added tvOS to Podspec

AFNetworking.podspec

@@ -30,6 +30,7 @@ EOS
   s.ios.deployment_target = '7.0'
   s.osx.deployment_target = '10.9'
   s.watchos.deployment_target = '2.0'
+  s.tvos.deployment_target = '9.0'
   
   s.subspec 'Serialization' do |ss|
     ss.source_files = 'AFNetworking/AFURL{Request,Response}Serialization.{h,m}'
@@ -48,6 +49,7 @@ EOS
   s.subspec 'Reachability' do |ss|
     ss.ios.deployment_target = '7.0'
     ss.osx.deployment_target = '10.9'
+    ss.tvos.deployment_target = '9.0'
 
     ss.source_files = 'AFNetworking/AFNetworkReachabilityManager.{h,m}'
     ss.public_header_files = 'AFNetworking/AFNetworkReachabilityManager.h'
@@ -56,10 +58,6 @@ EOS
   end
 
   s.subspec 'NSURLSession' do |ss|
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
-    ss.watchos.deployment_target = '2.0'
-    
     ss.dependency 'AFNetworking/Serialization'
     ss.ios.dependency 'AFNetworking/Reachability'
     ss.osx.dependency 'AFNetworking/Reachability'