org.kontalk: update to version 4.2.0-beta3 (399)
org.kontalk: update to version 4.2.0-beta3 (399)

Signed-off-by: Daniele Ricci <676578820c613041cb28e13de8d58e1d94456890@casaricci.it>

f-droid/fdroid-data,f-droid/fdroiddata,f-droid/fdroiddata