Updated README to explain that GCR and ECR are supported
Updated README to explain that GCR and ECR are supported

endocode/minikube,skipjaq/minikube,dalehamel/minikube,kubernetes/minikube,kubernetes/minikube,dongsupark/minikube,abbytiz/minikube,mikegrass/minikube,skipjaq/minikube,kubernetes/minikube,dongsupark/minikube,warmchang/minikube,aaron-prindle/minikube,kubernetes/minikube,dongsupark/minikube,warmchang/minikube,dlorenc/minikube,mikegrass/minikube,abbytiz/minikube,dlorenc/minikube,dalehamel/minikube,cu12/minikube,kubernetes/minikube,dalehamel/minikube,dlorenc/minikube,cu12/minikube,kubernetes/minikube,r2d4/minikube,dlorenc/minikube,cu12/minikube,warmchang/minikube,dlorenc/minikube,skipjaq/minikube,aaron-prindle/minikube,abbytiz/minikube,dlorenc/minikube,warmchang/minikube,endocode/minikube,warmchang/minikube,warmchang/minikube,dims/minikube,mikegrass/minikube,warmchang/minikube,dims/minikube,kubernetes/minikube,r2d4/minikube,aaron-prindle/minikube,r2d4/minikube,endocode/minikube,dlorenc/minikube,dims/minikube,dlorenc/minikube