Update README.md

Added PyPI badge

Author: jtc42

README.md

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 # python-labthings
 
 [![LabThings](https://img.shields.io/badge/-LabThings-8E00FF?style=flat&logo=data:image/png;base64,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)]()
+[![PyPI](https://img.shields.io/pypi/v/labthings)](https://pypi.org/project/labthings/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/labthings/)
 
 A Python implementation of the LabThings API structure, based on the Flask microframework.