Clarify support cycles for the releases temporarily

Releases are being fast tracked until we sync with the upstream
releases. The older releases will continue to be maintained for that
transition period or related upstream version deprecation whichever is
later.

Signed-off-by: Nabarun Pal <[email protected]>

Author: palnabarun

README.md

@@ -133,6 +133,8 @@ Kubernetes supports [three minor releases](https://github.com/kubernetes/communi
 
 Note: There would be no maintenance for alpha/beta releases except the latest one.
 
+**Exception to the above support rule:** Since we are running behind on releases, we will support Alpha/Beta releases for a greater number of clients until we catch up with the upstream version.
+
 ## Community, Support, Discussion
 
 If you have any problem on using the package or any suggestions, please start with reaching the [Kubernetes clients slack channel](https://kubernetes.slack.com/messages/C76GB48RK/), or filing an [issue](https://github.com/kubernetes-client/python/issues) to let us know. You can also reach the maintainers of this project at [SIG API Machinery](https://github.com/kubernetes/community/tree/master/sig-api-machinery), where this project falls under.