Update README.md

Author: elisemercury

README.md

@@ -20,7 +20,7 @@
 pip install difPy
 ```
 
-> ✨🚀 **Join the [difPy for Desktop beta tester](https://difpy.app/) program and be among to first to test the new difPy desktop app!**
+> ✨🚀 **Join the [difPy for Desktop beta tester](https://difpy.short.gy/desktop-beta-ghb) program and be among to first to test the new difPy desktop app!**
 
 > :open_hands: Our motto? We :heart: Open Source! **Contributions and new ideas for difPy are always welcome** - check our [Contributor Guidelines](https://difpy.readthedocs.io/en/latest/contributing.html) for more information.
 
@@ -204,7 +204,7 @@ difPy_xxx_stats.json
 
 The new difPy desktop app brings difPy directly to your desktop. We are now accepting beta tester sign ups and will soon be starting our first tester access wave.
 
-✨🚀 **Join the [difPy for Desktop beta tester](https://difpy.app/) program now and be among to first to test the new difPy desktop app!**
+✨🚀 **Join the [difPy for Desktop beta tester](https://difpy.short.gy/desktop-beta-ghb) program now and be among to first to test the new difPy desktop app!**
 
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