update README

README.md

 
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 # OutpostSpawner
 
-The OutpostSpawner in combination with the [JupyterHub Outpost service](https://github.com/kreuzert/jupyterhub/) enables JupyterHub to spawn single-user notebook servers on multiple remote resources.
+The OutpostSpawner in combination with the [JupyterHub Outpost service](https://github.com/kreuzert/jupyterhub-outpost) enables JupyterHub to spawn single-user notebook servers on multiple remote resources.
 
 ## Documentation