D-ATIS changes.

New release v6.30.3

Billing is not used for some time now. Remove.

Update packages.

New version 6.22.3

NEw release v6.22.2.

Prepare for release v6.21.2

New release: 6.21.0

* Fixed PDF viewer launching on Android 11

* Minimum version suported is 5.0 (SDK 21)

v6.20.1 (01/09/2021)

* TFR is working again.