Update podspec for new requirements, link CFNetwork.

Alamofire.podspec

@@ -8,10 +8,12 @@ Pod::Spec.new do |s|
   s.authors = { 'Alamofire Software Foundation' => 'info@alamofire.org' }
   s.source = { :git => 'https://github.com/Alamofire/Alamofire.git', :tag => s.version }
 
-  s.ios.deployment_target = '9.0'
-  s.osx.deployment_target = '10.11'
-  s.tvos.deployment_target = '9.0'
-  s.watchos.deployment_target = '2.0'
+  s.ios.deployment_target = '10.0'
+  s.osx.deployment_target = '10.12'
+  s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '3.0'
 
   s.source_files = 'Source/*.swift'
+  
+  s.frameworks = 'CFNetwork'
 end