Release v1.6.0 on 2021-11-16.

1. 0cbe8f0 tdef: Introduce min_val and max_val fields by Pau Espin Pedrol · 4 years, 10 months ago
2. 7e1b03f vty: command.c: Fix: multi-choice args are no longer passed incomplete to vty func by Pau Espin Pedrol · 5 years ago
3. 6df2e44 vty: command.c: Fix is_cmd_ambiguous() returning always 0 by Pau Espin Pedrol · 5 years ago
4. 5734bff represent negative T-timers as Osmocom-specific X-timers by Neels Hofmeyr · 5 years ago
5. 7b740f7 platform independence fix: tdef range tests by Neels Hofmeyr · 5 years ago
6. 0fd615f add osmo_tdef API, originally adopted from osmo-bsc T_def by Neels Hofmeyr · 5 years ago