[#28] - Fixes jetpack compose compatibility

[Marc-WAP]

This fixes the incompatibility problem with Android app projects which are using Jetpack Compose.

Error shown without this change:

Cannot access 'androidx.fragment.app.FragmentActivity' which is a supertype of 'de.raphaelebner.roomdatabasebackup.core.RoomBackup'. 
Check your module classpath for missing or conflicting dependencies

This PR will fix the problem mentioned in issue #28

[sonatype-lift]

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[rafi0101]

Looks fine, thank you