Update Changelog.md

Changelog.md

 # Changelog
 
 All notable changes to this project will be documented in this file.
+## [1.5] - 2024-03-12
+GAP Ansible collection version is pinned to 1.0.51
 ## [1.4] - 2024-02-27
 GAP Ansible collection version is pinned to 1.0.49
 ## [1.3] - 2024-02-09