Update README.md

Author: SilanHe

README.md

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 [![PyPI - Version](https://img.shields.io/pypi/v/aws-durable-execution-sdk-python-testing.svg)](https://pypi.org/project/aws-durable-execution-sdk-python-testing)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/aws-durable-execution-sdk-python-testing.svg)](https://pypi.org/project/aws-durable-execution-sdk-python-testing)
 
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+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/aws/aws-durable-execution-sdk-python-testing/badge)](https://scorecard.dev/viewer/?uri=github.com/aws/aws-durable-execution-sdk-python-testing)
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 ## Table of Contents