Prepare to release 5.1.1

Author: colinodell

CHANGELOG.md

@@ -4,6 +4,8 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 
 ## [Unreleased][unreleased]
 
+## [5.1.1] - 2023-07-12
+
 ### Fixed
 
 - Fixed `<pre>` tags with attributes not being parsed (#215, #238)
@@ -320,7 +322,8 @@ not ideally set, so this releases fixes that. Moving forwards this should reduce
 ### Added
  - Initial release
 
-[unreleased]: https://github.com/thephpleague/html-to-markdown/compare/5.1.0...master
+[unreleased]: https://github.com/thephpleague/html-to-markdown/compare/5.1.1...master
+[5.1.1]: https://github.com/thephpleague/html-to-markdown/compare/5.1.0...5.1.1
 [5.1.0]: https://github.com/thephpleague/html-to-markdown/compare/5.0.2...5.1.0
 [5.0.2]: https://github.com/thephpleague/html-to-markdown/compare/5.0.1...5.0.2
 [5.0.1]: https://github.com/thephpleague/html-to-markdown/compare/5.0.0...5.0.1