CHANGELOG.md update

Author: HardNorth

CHANGELOG.md

@@ -1,6 +1,9 @@
 # Changelog
 
 ## [Unreleased]
+### Added
+- Feature [#325](https://github.com/reportportal/agent-python-pytest/issues/325) Support of runtime attribute adding, by @yakovbabich, @HardNorth
+- `rp_launch_timeout` parameter to limit test execution in case of process hanging, by @HardNorth
 
 ## [5.1.3]
 ### Added