Fix podspec OS X deployment target

Author: fabiopelosin

AFNetworkActivityLogger.podspec

@@ -9,6 +9,7 @@ Pod::Spec.new do |s|
  s.source_files = 'AFNetworkActivityLogger.{h,m}'
  s.requires_arc = true
  s.ios.deployment_target = '6.0'
+ s.osx.deployment_target = '10.8'
 
  s.dependency 'AFNetworking', '~> 2.0'
 end