Update CHANGELOG.md

Author: gmponos

CHANGELOG.md

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 # Changelog
 
 All Notable changes to `gmponos/guzzle_logger` will be documented in this file
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+## 2.2.0 - 2021-04-04
+
+## Changes
+- Allow psr/log in version 2 and 3, like guzzlehttp/guzzle do it ([44](https://github.com/gmponos/guzzle-log-middleware/pull/44))
+
 ## 2.1.0 - 2021-03-18
 
 That was a long layoff