Update README.md

Update to 3.9+ only

README.md

@@ -7,7 +7,7 @@
 [![image](https://codecov.io/gh/AI-multimodal/Lightshow/branch/master/graph/badge.svg?token=CW7BMFA5O7)](https://codecov.io/gh/AI-multimodal/Lightshow)
 [![image](https://app.codacy.com/project/badge/Grade/d31a4e18672c4d71bbaafa719181c140)](https://www.codacy.com/gh/AI-multimodal/Lightshow/dashboard?utm_source=github.com&utm_medium=referral&utm_content=AI-multimodal/Lightshow&utm_campaign=Badge_Grade)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
-[![python](https://img.shields.io/badge/-Python_3.7+-blue?logo=python&logoColor=white)](https://github.com/pre-commit/pre-commit)
+[![python](https://img.shields.io/badge/-Python_3.9+-blue?logo=python&logoColor=white)](https://github.com/pre-commit/pre-commit)
 </div>
 
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