README.md in acme-client-0.6.3 vs README.md in acme-client-1.0.0

@@ -1,4 +1,8 @@
+# Deprecated
+
+This branch track the client for ACMEv1.
+
 # Acme::Client
 
 [![Build Status](https://travis-ci.org/unixcharles/acme-client.svg?branch=master)](https://travis-ci.org/unixcharles/acme-client)
 
 `acme-client` is a client implementation of the [ACME](https://github.com/ietf-wg-acme/acme/) protocol in Ruby.