Add pip badge

Add pip version badge

Author: juniortada

README.md

@@ -2,6 +2,7 @@
 
 [![Active Development](https://img.shields.io/badge/Maintenance%20Level-Actively%20Developed-brightgreen.svg)](https://gist.github.com/cheerfulstoic/d107229326a01ff0f333a1d3476e068d)
 ![status](https://img.shields.io/badge/status-stable-green.svg) ![https://github.com/TadaSoftware/PyNFe/actions](https://github.com/TadaSoftware/PyNFe/workflows/PyNFe%20CI/badge.svg?branch=master) ![pyversions](https://img.shields.io/badge/python-3.6%20%7C%203.7%20%7C%203.8%20%7C%203.9%20%7C%203.10-blue)
+[![PyPI version](https://badge.fury.io/py/pynfe.svg)](https://badge.fury.io/py/pynfe)
 
 
 Biblioteca de interface com os webservices de Nota Fiscal Eletrônica (NF-e) e Nota Fiscal de Consumidor Eletrônica (NFC-e) da SEFAZ e Receita Federal do Brasil, Nota Fiscal de Serviço Eletrônica (NFS-e) para Prefeituras e Manifesto de Documentos Fiscais Eletrônicos (MDF-e).