Prepare for release 2.6.1

Author: ramsey

CHANGELOG.md

@@ -1,5 +1,13 @@
 # OAuth 2.0 Client Changelog
 
+## 2.6.1
+
+_Released: 2021-12-22_
+
+* Fix deprecation notices, providing full support for PHP 8.1
+  [#919](https://github.com/thephpleague/oauth2-client/pull/919)
+  [#920](https://github.com/thephpleague/oauth2-client/pull/920)
+
 ## 2.6.0
 
 _Released: 2020-10-27_

README.md

@@ -24,6 +24,7 @@ This package is compliant with [PSR-1][], [PSR-2][], [PSR-4][], and [PSR-7][]. I
 
 We support the following versions of PHP:
 
+* PHP 8.1
 * PHP 8.0
 * PHP 7.4
 * PHP 7.3