Merge pull request kubernetes-retired#745 from vishh/docs

Add minimum kube version requirement.

README.md

@@ -5,7 +5,10 @@
 Heapster enables Container Cluster Monitoring and Performance Analysis.
 
 Heapster currently supports [Kubernetes](https://github.com/kubernetes/kubernetes) and CoreOS natively.
+*Heapster is compatible with kubernetes versions starting from v1.0.6 only*
+
 It can be extended to support other cluster management solutions easily.
+
 Heapster collects and interprets various signals like compute resource usage, lifecycle events, etc, and exports cluster metrics via [REST endpoints](docs/model.md).
 **Note: Some of the endpoints are only valid in Kubernetes clusters**