Add travis badge to README.md
Add travis badge to README.md

luxas/minikube,r2d4/minikube,dlorenc/minikube,warmchang/minikube,abbytiz/minikube,skipjaq/minikube,budhrg/minishift,endocode/minikube,warmchang/minikube,skipjaq/minikube,mikegrass/minikube,dlorenc/minikube,LalatenduMohanty/minishift,warmchang/minikube,warmchang/minikube,dalehamel/minikube,kubernetes/minikube,kubernetes/minikube,thatdocslady/minishift,dims/minikube,dongsupark/minikube,dlorenc/minikube,warmchang/minikube,minishift/minishift,LalatenduMohanty/minishift,kubernetes/minikube,Preeticp/minishift,kubernetes/minikube,Preeticp/minishift,mikegrass/minikube,r2d4/minikube,Preeticp/minishift,thatdocslady/minishift,dlorenc/minikube,budhrg/minishift,endocode/minikube,kubernetes/minikube,aaron-prindle/minikube,jimmidyson/minishift,aaron-prindle/minikube,dongsupark/minikube,jimmidyson/minishift,praveenkumar/minishift,dlorenc/minikube,dlorenc/minikube,thatdocslady/minishift,minishift/minishift,dims/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube,budhrg/minishift,abbytiz/minikube,minishift/minishift,jimmidyson/minishift,endocode/minikube,dongsupark/minikube,warmchang/minikube,luxas/minikube,cu12/minikube,aaron-prindle/minikube,r2d4/minikube,mikegrass/minikube,praveenkumar/minishift,abbytiz/minikube,praveenkumar/minishift,dlorenc/minikube,cu12/minikube,dims/minikube,dalehamel/minikube,LalatenduMohanty/minishift,kubernetes/minikube,dalehamel/minikube,skipjaq/minikube,cu12/minikube