docs: removed outdated versions link from README

Author: buchdag

README.md

@@ -27,17 +27,11 @@ There are three common ways to run docker-gen:
 
 #### Host Install
 
-Linux/OSX binaries for release [0.9.0](https://github.com/nginx-proxy/docker-gen/releases)
-
-- [amd64](https://github.com/nginx-proxy/docker-gen/releases/download/0.9.0/docker-gen-linux-amd64-0.9.0.tar.gz)
-- [i386](https://github.com/nginx-proxy/docker-gen/releases/download/0.9.0/docker-gen-linux-i386-0.9.0.tar.gz)
-- [alpine-linux](https://github.com/nginx-proxy/docker-gen/releases/download/0.9.0/docker-gen-alpine-linux-amd64-0.9.0.tar.gz)
-
 Download the version you need, untar, and install to your PATH.
 
 ```console
-wget https://github.com/nginx-proxy/docker-gen/releases/download/0.9.0/docker-gen-linux-amd64-0.9.0.tar.gz
-tar xvzf docker-gen-linux-amd64-0.9.0.tar.gz
+wget https://github.com/nginx-proxy/docker-gen/releases/download/0.12.0/docker-gen-linux-amd64-0.12.0.tar.gz
+tar xvzf docker-gen-linux-amd64-0.12.0.tar.gz
 ./docker-gen
 ```