Update change log

Author: MarkBaker

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
+- Fix for Xls Reader when SST has a bad length [#1592](https://github.com/PHPOffice/PhpSpreadsheet/issues/1592)
 - Resolve Xlsx loader issue whe hyperlinks don't have a destination 
 - Resolve issues when printer settings resources IDs clash with drawing IDs
 - Resolve issue with SLK long filenames [#1612](https://github.com/PHPOffice/PhpSpreadsheet/issues/1612)