Updated README to explain how to set the -fno-objc-arc for all file…

…s at once, saving a bunch of clicking for users.

README.md

@@ -156,7 +156,7 @@ AFNetworking uses [`NSJSONSerialization`](http://developer.apple.com/library/mac
 
 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. In the "Compiler Flags" column, set `-fno-objc-arc` for each of the AFNetworking source files.
+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.
 
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