Cognito Sync Demo Project: UnityException: Launching iOS project via Xcode failed.

Hi Experts,

I found Launching iOS project via Xcode failed with Cognito Sync Demo Project.

The root of this issue is 'autorelease' is unavailable: not available in automatic reference counting mode.

Therefore, I introduced the below work　around（Put -fno-objc-arc in the compile flags of the FbUnityInterface.mm on Unity editor）and then, this issue is not occurred.
http://devquestion.tk/29318048/workaround-for-unity5-ios-compile-error-with-facebook-unity-sdk-6-2-1.html

If this is bug, please fix it.

Thanks,
Akira Ueda