Update changelog for 0.22.0 release

Author: turtle0x1

CHANGELOG.md

@@ -4,6 +4,15 @@ All Notable changes to `php-lxd` will be documented in this file.
 
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+# [0.22.0]
+
+## Added
+  - Recursion parameter for all project method
+
+## Fixed
+  - If source host is using the socket when migrating an instance, use host
+    environment address instead of client url
+
 # [0.21.0]
 
 ## Added