Added the tvos deployment target to the podspec.

Alamofire.podspec

@@ -10,6 +10,7 @@ Pod::Spec.new do |s|
 
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.9'
+  s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
 
   s.source_files = 'Source/*.swift'