Merge pull request betatim#11 from fhoehle/update_jupyterlab-server-proxy

update jupyterlab-server-proxy reference

Author: betatim

postBuild

@@ -2,7 +2,7 @@
 
 # Enable the proxy extension in notebook and lab
 jupyter serverextension enable --py jupyter_server_proxy
-jupyter labextension install jupyterlab-server-proxy
+jupyter labextension install @jupyterlab/server-proxy
 jupyter lab build
 
 code-server --install-extension ms-python.python