Merge pull request #64 from php-http/Nyholm-patch-1

Prepare for release of 2.1.0

Author: dbu

Diff for: CHANGELOG.md

@@ -5,6 +5,11 @@ 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).
 
+## 2.1.0 - 2019-12-27
+
+### Added
+
+- Symfony 5 support
 
 ## 2.0.0 - 2019-03-05