Update snapshot download links to joska's server

Author: mikrosk

README.md

@@ -1,5 +1,5 @@
 [![Build Status](https://github.com/freemint/gemlib/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/freemint/gemlib/actions) 
 
-* Latest snapshot: [Download (mint)](https://tho-otto.de/snapshots/gemlib/gemlib-mint-latest.tar.bz2)
-* Latest snapshot: [Download (mintelf)](https://tho-otto.de/snapshots/gemlib/gemlib-mintelf-latest.tar.bz2)
-* [Archive](https://tho-otto.de/snapshots/gemlib/)
+* Latest snapshot: [Download (mint)](https://atari.joska.no/snapshots/gemlib/gemlib-mint-latest.tar.bz2)
+* Latest snapshot: [Download (mintelf)](https://atari.joska.no/snapshots/gemlib/gemlib-mintelf-latest.tar.bz2)
+* [Archive](https://atari.joska.no/snapshots/gemlib/)