Bumps macOS deployment target to 10.9 (parse-community#1455)

* Bumps macOS deployment version to 10.9
Due to NSURLSession

Author: drdaz

Parse.podspec

@@ -11,7 +11,7 @@ Pod::Spec.new do |s|
 
   s.platform = :ios, :osx, :tvos, :watchos
   s.ios.deployment_target = '8.0'
-  s.osx.deployment_target = '10.2'
+  s.osx.deployment_target = '10.9'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '2.0'