Release 2.2.5.

Author: bgrainger

docs/content/overview/version-history.md

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-lastmod: 2022-12-23
+lastmod: 2023-01-01
 date: 2017-03-27
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 # Version History
 
+### 2.2.5
+
+* Add support for `DECIMAL UNSIGNED`, fixing error in `DeriveParameters`: [#1272](https://github.com/mysql-net/MySqlConnector/issues/1272).
+* Fix parsing `nan` as float/double value on .NET Framework.
+
 ### 2.2.4
 
 * Fix a race condition in recovering leaked sessions: [#1263](https://github.com/mysql-net/MySqlConnector/issues/1263).