Update requirements for jupyter-server-proxy

Author: consideRatio

setup.py

@@ -2,15 +2,15 @@
 
 setuptools.setup(
     name="jupyter-rsession-proxy",
-    version='2.2.0',
+    version='2.2.1',
     url="https://github.com/jupyterhub/jupyter-rsession-proxy",
     author="Ryan Lovett & Yuvi Panda",
     description="Jupyter extension to proxy RStudio",
     packages=setuptools.find_packages(),
 	keywords=['Jupyter'],
 	classifiers=['Framework :: Jupyter'],
     install_requires=[
-        'jupyter-server-proxy>=3.2.2'
+        'jupyter-server-proxy>=3.2.3,!=4.0.0,!=4.1.0'
     ],
     entry_points={
         'jupyter_serverproxy_servers': [