Update README.md

Author: Rdornier

README.md

@@ -17,6 +17,10 @@ they can play nice.
 > In case you are stuck with QuPath v0.3.2, [the last release to work is v0.5.1](https://github.com/BIOP/qupath-extension-cellpose/releases/tag/v0.5.1)
 
 
+> [!WARNING]
+> - Currently, the cellpose-extension hasn't been tested on HPC clusters.
+> - The latest version of cellpose (cellpose-sam v4.0.x) is not yet supported by the extension.
+
 # Citing
 
 Please cite this extension by linking it to this GitHub or to the release you used, and feel free to give us a star ⭐️