chore: creating version 2.20

Author: gershnik

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
+## [2.20] - 2025-07-16
+
 ### Fixed
 - Incorrect CMake test for Python presence at buildtime
 
@@ -209,3 +211,4 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 [2.17]: https://github.com/gershnik/sys_string/releases/v2.17
 [2.18]: https://github.com/gershnik/sys_string/releases/v2.18
 [2.19]: https://github.com/gershnik/sys_string/releases/v2.19
+[2.20]: https://github.com/gershnik/sys_string/releases/v2.20

lib/VERSION

@@ -1 +1 @@
-2.19
+2.20