Added action to Github-Actions List

Hey @mariamrf 

Thanks for the contribution over on github-actions site.

I have added a badge if you are interested.

Keep up the good work 👍 🎉

README.md

@@ -1,4 +1,7 @@
 # py-lambda-action
+
+[![GitHubActions](https://img.shields.io/badge/listed%20on-GitHubActions-blue.svg)](https://github-actions.netlify.com/py-lambda)
+
 A Github Action to deploy AWS Lambda functions written in Python with their dependencies in a separate layer. For now, only works with Python 3.6.
 
 ## Use