Depend on jupyterlab-server bw-list branch

setup.py

@@ -142,7 +142,7 @@ setup_args = dict(
 setup_args['install_requires'] = [
     'notebook>=4.3.1',
     'tornado!=6.0.0, !=6.0.1, !=6.0.2',
-    'jupyterlab_server~=1.0.0',
+    'jupyterlab_server@ git+https://github.com/datalayer-contrib/jupyterlab-server@bw-list',
     'jinja2>=2.10'
 ]