Guides for upgrading between Input SDK versions.

- `1.1.0-beta`from`1.0.0-beta`([Java/Kotlin](https://developer.android.com/games/playgames/input-sdk-migration-2),[Unity](https://developer.android.com/games/playgames/input-sdk-migration-unity-2))
- `1.0.0-beta`from`0.0.4`([Java/Kotlin](https://developer.android.com/games/playgames/input-sdk-migration),[Unity](https://developer.android.com/games/playgames/input-sdk-migration-unity))