Update README.md

Author: matuskosut

README.md

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-# jupyter-pgadmin-proxy
+# Jupyter pgAdmin proxy
+
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/jupyter-pgadmin-proxy.svg)](https://pypi.org/project/jupyter-pgadmin-proxy/)
 
 jupyter-pgadmin-proxy provides Jupyter extension to run [pgAdmin 4](https://pypi.org/project/pgadmin4/). See also official pages for [pgAdmin](https://www.pgadmin.org/).