Update CHANGELOG for version 1.0.0-rc.3

CHANGELOG.md

@@ -3,7 +3,7 @@ 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).
 
-## [Unreleased][unreleased]
+## [1.0.0-rc.3][1.0.0-rc.3] - 2021-10-25
 
 - Replace `UseLog4NetXmlNamespace(null)` with `UseNoXmlNamespace()`
 - Reduce the public API surface
@@ -59,7 +59,7 @@ Still trying to figure out how to make everything fit together with [MinVer](htt
 
 - Implement log4j compatibility mode.
 
-[unreleased]: https://github.com/serilog-contrib/serilog-formatting-log4net/compare/1.0.0-rc.2...HEAD
+[1.0.0-rc.3]: https://github.com/serilog-contrib/serilog-formatting-log4net/compare/1.0.0-rc.2...1.0.0-rc.3
 [1.0.0-rc.2]: https://github.com/serilog-contrib/serilog-formatting-log4net/compare/1.0.0-rc.1...1.0.0-rc.2
 [1.0.0-rc.1]: https://github.com/serilog-contrib/serilog-formatting-log4net/compare/1.0.0-alpha.0.110...1.0.0-rc.1
 [1.0.0-alpha.0.110]: https://github.com/serilog-contrib/serilog-formatting-log4net/releases/tag/1.0.0-alpha.0.110