Improves placement of temporary notice

Author: solsson

README.md

@@ -1,10 +1,8 @@
-
-
-# Kafka on Kubernetes
-
 _Manifests here now require Kubernetes 1.8.
 On earlier versions use [v2.1.0](https://github.com/Yolean/kubernetes-kafka/tree/v2.1.0)._
 
+# Kafka on Kubernetes
+
 Transparent Kafka setup that you can grow with.
 Good for both experiments and production.