Update README.md

jeremyephron · Sep 13, 2020 · 7b7c6fd · 7b7c6fd
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 A simple Gmail API client in Python for applications.
 
+# Note about upgrading to v3.0.0
+
+The newest release is not backwards compatible with previous versions, so you'll need to re-authenticate tokens you have for existing projects upon upgrading.
+
 Currently Supported Behavior:
 - Sending html messages
 - Sending messages with attachments