Update min macOS version requirement to 10.9

Configurations/SocketRocket-macOS.xcconfig

@@ -12,6 +12,6 @@
 
 PRODUCT_NAME = SocketRocket
 PRODUCT_BUNDLE_IDENTIFIER = com.facebook.socketrocket.macos
-MACOSX_DEPLOYMENT_TARGET = 10.8
+MACOSX_DEPLOYMENT_TARGET = 10.9
 
 INFOPLIST_FILE = $(SRCROOT)/SocketRocket/Resources/Info.plist

SocketRocket.podspec

@@ -12,7 +12,7 @@ Pod::Spec.new do |s|
   s.public_header_files = 'SocketRocket/*.h'
 
   s.ios.deployment_target  = '9.0'
-  s.osx.deployment_target  = '10.8'
+  s.osx.deployment_target  = '10.9'
   s.tvos.deployment_target = '9.0'
 
   s.ios.frameworks     = 'CFNetwork', 'Security'