Update CHANGELOG.md [CI SKIP]

Author: bradrydzewski

CHANGELOG.md

@@ -4,6 +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]
+### Added
+
+- Fix missing sha for Gitea tag hooks, from [@techknowlogick](https://github.com/techknowlogick). See [#22](https://github.com/drone/go-scm/pull/22).
+
 ## [1.4.0]
 ### Added