Release v1.5.0 on 2021-02-23.

1. a829b45 use osmo_init_logging2() with proper talloc ctx by Neels Hofmeyr · 6 years ago
2. 39720ac abis_test: sanitize: fix msgb memleak by Neels Hofmeyr · 7 years ago
3. e08da97 Fix/Update copyright notices; Add SPDX annotation by Harald Welte · 7 years ago
4. 039171a abis_test.c: Fix warning appearing on some buggy gcc versions by Pau Espin Pedrol · 7 years ago
5. f74cfd3 Add SW Description (de)marshalling by Max · 7 years ago