Update CHANGELOG.md

Co-authored-by: Josh Cooper <737664+joshcooper@users.noreply.github.com>

Author: david22swan

CHANGELOG.md

@@ -3,7 +3,7 @@
 All significant changes to this repo will be summarized in this file.
 
 
-## [1.9.0](https://github.com/puppetlabs/puppet-resource_api/tree/1.8.18) (2023-08-08)
+## [1.9.0](https://github.com/puppetlabs/puppet-resource_api/tree/1.9.0) (2023-08-08)
 
 [Full Changelog](https://github.com/puppetlabs/puppet-resource_api/compare/1.8.18...1.8.18)