[#1466][#1467] Update release notes for autocompletion subcommand ali…

…as fix

RELEASE-NOTES.md

@@ -20,6 +20,7 @@ Picocli follows [semantic versioning](http://semver.org/).
 
 ## <a name="4.6.3-fixes"></a> Fixed issues
 * [#1474] Bugfix: Avoid `UnsupportedCharsetException: cp65001` on Microsoft Windows console when code page is set to UTF-8. Thanks to [epuni](https://github.com/epuni) for raising this.
+* [#1466][#1467] Bugfix/Enhancement: Autocomplete now shows subcommand aliases in the completion candidates. Thanks to [Ruud Senden](https://github.com/rsenden) for the pull request.
 * [#1475] Enhancement: Fix typo in annotation target-type error message. Thanks to [Ross Goldberg](https://github.com/rgoldberg) for the pull request.
 * [#1409][#1463] DOC: add documentation section on using default values in argument groups. Thanks to [Ben Kedo](https://github.com/MadFoal) for the pull request.
 * [#1462] DOC, BUILD, DEP: Extend documentation on argument files, fix broken/outdated links, update dependencies. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.