Update README.md

Remove outdated or incorrect info, and indicate the repo is abandoned

README.md

@@ -1,19 +1,8 @@
 # Sekken
 
-Heavy metal SOAP client
-
-[Documentation](https://savonrb.com) | [RDoc](https://rubydoc.info/gems/savon) |
-[Mailing list](https://groups.google.com/forum/#!forum/savonrb) | [Twitter](https://twitter.com/savonrb)
+Sekken is no longer under development, and does not release maintenance or security updates.
 
 [![Ruby CI](https://github.com/savonrb/sekken/actions/workflows/ci.yml/badge.svg)](https://github.com/savonrb/sekken/actions/workflows/ci.yml)
 [![Gem Version](https://badge.fury.io/rb/sekken.svg)](https://badge.fury.io/rb/sekken)
 [![Code Climate](https://codeclimate.com/github/savonrb/sekken.svg)](https://codeclimate.com/github/savonrb/sekken)
 [![Coverage Status](https://coveralls.io/repos/savonrb/sekken/badge.svg?branch=master)](https://coveralls.io/r/savonrb/sekken)
-
-
-## Version 3
-
-**Status: Unstable.** Sekken is currently under development and available for testing on GitHub.
-Use this version if you can handle changes and want to provide feedback.
-
-Sekken is still in a very early stage, but [there is some documentation!](http://savonrb.com/version3/)