Prepare for v1.1 release

Author: paulbalandan

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this library will be documented in this file.
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/CodeIgniter/coding-standard/compare/v1.0.0...HEAD) - 20xx-xx-xx
+## [v1.1.0](https://github.com/CodeIgniter/coding-standard/compare/v1.0.0...v1.1.0) - 2021-08-31
 
 - Bump to `friendsofphp/php-cs-fixer` v3.1.0
 - Fix release script