Release v1.5.2 on 2021-09-24.

1. e08da97 Fix/Update copyright notices; Add SPDX annotation by Harald Welte · 7 years ago
2. 008e53b utils: Introduce OSMO_ASSERT in the utils and use it in the unit tests by Katerina Barone-Adesi · 11 years ago
3. 3309a43 Added a ring buffer log target to store the last N log messages. by Katerina Barone-Adesi · 11 years ago
4. efd2bd6 Revert "Added a ring buffer log target to store the last N log messages." by Holger Hans Peter Freyther · 11 years ago
5. 7337722 Added a ring buffer log target to store the last N log messages. by Katerina Barone-Adesi · 11 years ago