Update version in README

Author: SimoTod@users.noreply.github.com

CHANGELOG.md

@@ -5,6 +5,8 @@ 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]
+
+## [1.1.x] - 2021-03-15
 ### Added
 - [`x-unsafe-html`]: Added 'x-unsafe-html' custom directive