Filter practice data by instrument

Hi, it will be nice if we can filter statistics by instrument i.e. how much in piano and how much in sax.

Changed the title from "Filter in statistics - Android App" to "Filter in statistics - app"

System update: Updated iOS app to released.

System update: Changed the title from "Filter in statistics - app" to "Filter practice data by instrument".

System update: Updated Android app to planned.

Thanks - this is definitely in the works and already out on iOS side! :)