Updating requirements

Removing note about ARC compatibility

README.md

@@ -143,20 +143,7 @@ operation.outputStream = [NSOutputStream outputStreamToMemory];
 
 ## Requirements
 
-AFNetworking requires either [iOS 4.0](http://developer.apple.com/library/ios/#releasenotes/General/WhatsNewIniPhoneOS/Articles/iPhoneOS4.html) and above, or [Mac OS 10.6](http://developer.apple.com/library/mac/#releasenotes/MacOSX/WhatsNewInOSX/Articles/MacOSX10_6.html#//apple_ref/doc/uid/TP40008898-SW7) ([64-bit with modern Cocoa runtime](https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtVersionsPlatforms.html)) and above.
-
-AFNetworking uses [`NSJSONSerialization`](http://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html) if it is available. If your app targets a platform where this class is not available you can include one of the following JSON libraries to your project for AFNetworking to automatically detect and use.
-
-* [JSONKit](https://github.com/johnezang/JSONKit)
-* [SBJson](https://stig.github.com/json-framework/)
-* [YAJL](https://lloyd.github.com/yajl/)
-* [NextiveJson](https://github.com/nextive/NextiveJson)
-
-### ARC Support
-
-AFNetworking will transition its codebase to ARC in a future release.
-
-If you are including AFNetworking in a project that uses [Automatic Reference Counting (ARC)](http://clang.llvm.org/docs/AutomaticReferenceCounting.html) enabled, you will need to set the `-fno-objc-arc` compiler flag on all of the AFNetworking source files. To do this in Xcode, go to your active target and select the "Build Phases" tab. Now select all AFNetworking source files, press Enter, insert `-fno-objc-arc` and then "Done" to disable ARC for AFNetworking.
+AFNetworking requires either [iOS 5.0](http://developer.apple.com/library/ios/#releasenotes/General/WhatsNewIniPhoneOS/Articles/iPhoneOS4.html) and above, or [Mac OS 10.7](http://developer.apple.com/library/mac/#releasenotes/MacOSX/WhatsNewInOSX/Articles/MacOSX10_6.html#//apple_ref/doc/uid/TP40008898-SW7) ([64-bit with modern Cocoa runtime](https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtVersionsPlatforms.html)) and above.
 
 ## Credits