Add shield

Author: zachkirsch

README.md

@@ -1,6 +1,7 @@
 # Raven Python Library
 
 [![pypi](https://img.shields.io/pypi/v/ravendev.svg)](https://pypi.python.org/pypi/ravendev)
+[![fern shield](https://img.shields.io/badge/%F0%9F%8C%BF-SDK%20generated%20by%20Fern-brightgreen)](https://github.com/fern-api/fern)
 
 
 ## Documentation