Add PyPI release badge (#40)

Co-authored-by: Daniel Frankcom <[email protected]>

Author: danielfrankcom

README.md

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 # Aurora DSQL adapter for Django
 
+<a href="https://pypi.org/project/aurora-dsql-django"><img alt="PyPI - Version" src="https://img.shields.io/pypi/v/aurora-dsql-django?style=for-the-badge"></a>
+
 This is the adapter for enabling development of Django applications using Aurora DSQL.
 
 ## Requirements