Updating CHANGELOG for 0.9.30
Updating CHANGELOG for 0.9.30

    ** BREAKING CHANGES **
        * `PlayerStats` is now a standalone class, rather than a subclass of `PlayGamesLocalUser`. All existing references to `PlayGamesLocalUser.PlayerStats` should now directly refer to `PlayerStats`.
        * The `NumOfSessions` property in `PlayerStats` has been renamed `NumberOfSessions` to be consistent with other properties.
    New Features:
        * Rebase PlayerStats API to use the Play Games C++ SDK.
        * PlayerStats API now supported on iOS.
        * Added an option to PlayGamesClientConfiguration to require Google+.
    Bug Fixes:
        * #917 iOS 9, game freeze after closing authentication window
        * #919 Resolves Android jars even when target is not android.
        * #868 Avoid memory allocations in the PlayGamesHelperObject.
        * #865 GetIdToken needs to be asynchronous.

Change-Id: Ib563eb7f781c41d38c85975073f00cac9f8224c0

claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity