Update README.md

Author: gkorland

README.md

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+[![Known Vulnerabilities](https://snyk.io/test/github/RediSearch/redisearch-py/badge.svg?targetFile=requirements.txt)](https://snyk.io/test/github/RediSearch/redisearch-py?targetFile=requirements.txt)
 
 # RediSearch Python Client
 [![Mailing List](https://img.shields.io/badge/Mailing%20List-RediSearch-blue)](https://groups.google.com/forum/#!forum/redisearch)