support for iOS 9

[bensonyang2015]

I've locally changed settings to support iOS 9 and it works perfectly.
Would you do that to officially support iOS 9?

[BasThomas]

Feel free to open a pull request 😀

_{Sent with GitHawk}

[rnystrom]

I'd be happy to review a PR!

[Fogh]

I have created a pull request for this - #40. Only the podspec needs to be updated.