Update README.md

Author: robmarkcole

README.md

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+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
+[![PyPI Version](https://img.shields.io/pypi/v/deepstack-python.svg)](https://pypi.org/project/deepstack-python/)
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 # deepstack-python
 Unofficial python API for DeepStack