Update README.md

Update README to reflect deprecation of this project.

Author: bradnicholson

README.md

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+# Governor has been deprecated.
+Compose are no longer maintaining Governor as an active project. We are pleased to say that Governor seeded the [Patroni](https://github.com/zalando/patroni) project which Compose has now adopted as their HA solution. We recommend it to anyone seeking similar functionality to Governor. We have archived the project on GitHub; you are free to use it and fork it, but we will not be accepting issues or pull requests.
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 # Governor: A Template for PostgreSQL HA with etcd
 
 *There are many ways to run high availability with PostgreSQL; here we present a template for you to create your own custom fit high availability solution using etcd and python for maximum accessibility.*