[iOS & Android] Senstroke Update 2.1

[iOS & Android] Senstroke Update 2.1
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New version of the app (IOS and Android)! :v:t2:
This version introduces new lessons to practice left hand/right hand rudiments, you gonna be the master of paradiddles !

We have also added a preview button to listen to a lesson before launching it, very useful!

Thoughts ?