Add the Buildkite button

Author: toolmantim

Readme.md

@@ -1,10 +1,10 @@
 # Buildkite Golang Docker Example
 
+[![Add to Buildkite](https://buildkite.com/button.svg)](https://buildkite.com/new)
+
 This repository is an example on how to test a Golang project through Docker
 using Buildkite.
 
-[Add this example to your Buildkite organization](https://buildkite.com/new)
-
 ## Using in your own build pipelines
 
 1. Ensure `docker-compose` is installed on your build system. For details on how to do this, see: https://docs.docker.com/compose/install/