update to take jupyter-server/jupyter_server#180

Author: echarles

setup.py

@@ -61,7 +61,7 @@ def run(self):
     platforms="Linux, Mac OS X, Windows",
     packages=setuptools.find_packages(),
     install_requires=[
-        'jupyter_server@ git+https://github.com/datalayer-contrib/jupyter-server.git@extension_handlers',
+        'jupyter_server@ git+https://github.com/datalayer-contrib/jupyter-server.git@discover-extensionapp-config',
         'notebook<7',
     ],
     classifiers=[
@@ -92,4 +92,4 @@ def run(self):
             'pytest'
         ],
     },
-)
+)