Bump version number

Author: yuvipanda

setup.py

@@ -6,7 +6,7 @@
 
 setuptools.setup(
     name="jupyter-server-proxy",
-    version='1.5.2',
+    version='1.5.3',
     url="https://github.com/jupyterhub/jupyter-server-proxy",
     author="Ryan Lovett & Yuvi Panda",
     author_email="[email protected]",