Add CHANGELOG entry for #583

Author: svenstaro

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 - Fix undeterministically ordered module list [#528](https://github.com/svenstaro/genact/pull/528) (thanks @VergeDX)
+- Implement `--instant-print-lines` argument [#583](https://github.com/svenstaro/genact/pull/583) (thanks @josherrickson)
 
 ## [1.2.2] - 2022-10-10
 - Add manpage printing via `--print-manpage`