added Pull #1024

Author: gitbrent

CHANGELOG.md

@@ -9,6 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [3.9.0] - 2021-12-??
 
+### Added
+
+- Added media cover images & file extensions; media is resued now (same file is only loaded and written to PPTX once) [\#1024](https://github.com/gitbrent/PptxGenJS/pull/1024) ([canwdev](https://github.com/canwdev))
+
 ### Fixed
 
 - Use encodeXmlEntities for formatCode attributes [\#955](https://github.com/gitbrent/PptxGenJS/pull/955) ([dimfeld](https://github.com/dimfeld))