Let Travis track the latest stable Go 1.x release.
Let Travis track the latest stable Go 1.x release.

This keeps us in sync with what the developers are likely using, as well
as lowers the maintenance burden by not requiring this file to be
manually edited every 6 months.

dlorenc/minikube,warmchang/minikube,dalehamel/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,dlorenc/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,dalehamel/minikube,warmchang/minikube,dlorenc/minikube,dalehamel/minikube,dlorenc/minikube,dlorenc/minikube