docs(README): remove 'previous version' notice

Author: Integralist

README.md

@@ -2,11 +2,6 @@
 
 A Python client library for interacting with most facets of the [Fastly API](https://developer.fastly.com/reference/api).
 
-> NOTE: This 1.x release is a new [generated API client](https://dev.to/fastly/better-fastly-api-clients-with-openapi-generator-3lno) for the Fastly API.
-> The previous 0.5.x version is no longer supported, but can be found at https://github.com/fastly/fastly-py/tree/v0.5.x.
-
-
-
 ## Requirements
 
 Python >=3.6