Embed bitcode in CocoaPods artifact

[derwaldgeist]

Thanks for this library. I am using this as part of a Unity plugin, and until recently, it worked fine. But now I ran into a problem: Since the latest Unity version, only libraries that include Bitcode compile when building for the app store. Since this library does not embed Bitcode, the build will fail. Any change to push a new version to CocoaPods so the builds will work again? Thanks in advance.