Update appimageupdate.md

Author: ivan-hc

apps/appimageupdate.md

@@ -1,8 +1,8 @@
 # APPIMAGEUPDATE
 
- AppImageUpdate lets you update AppImages using information embedded in the AppImage itself, if provided by the developer of the AppImage.
+ A Rust implementation of AppImageUpdate, a tool for updating AppImages using efficient delta updates using zsync.
 
- SITE: https://github.com/AppImage/AppImageUpdate
+ SITE: https://github.com/pkgforge-dev/AppImageUpdate
 
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