update changelog for 1.5 [ci skip]

Author: bradrydzewski

CHANGELOG.md

@@ -4,10 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.5.0]
 ### Added
 
 - Fix missing sha for Gitea tag hooks, from [@techknowlogick](https://github.com/techknowlogick). See [#22](https://github.com/drone/go-scm/pull/22).
+- Support for Gitea webhook signature verification, from [@techknowlogick](https://github.com/techknowlogick).
 
 ## [1.4.0]
 ### Added