Update link at README.md

Author: Dmitriy Yukhanov

README.md

@@ -3,6 +3,6 @@ Allows to import Unity packages into specified folder to avoid your project's ro
 
 [Read more](Unity%20Projects/Package2Folder%20Master/Assets/Plugins/CodeStage/Package2Folder/readme.txt)
 
-[Changelog](Unity%20Projects/Package2Folder%20Master/Assets/Plugins/CodeStage/Package2Folder/changelog.txt)
+[Changelog](Unity%20Projects/Package2Folder%20Master/Assets/Plugins/CodeStage/Package2Folder/changelog.md)
 
-[Mozilla Public License Version 2.0](LICENSE)
+[Mozilla Public License Version 2.0](LICENSE)