Updated README

Author: alexgolec

README.rst

@@ -1,6 +1,9 @@
 ``tda-api``: A TD Ameritrade API Wrapper
 ========================================
 
+.. image:: https://img.shields.io/endpoint.svg?url=https%3A%2F%2Fshieldsio-patreon.vercel.app%2Fapi%3Fusername%3Dalexgolec%26type%3Dpatrons&style=flat
+  :target: https://patreon.com/alexgolec
+
 .. image:: https://img.shields.io/discord/720378361880248621.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2
   :target: https://discord.gg/nfrd9gh