"kubectl create -f locust-master-controller.yaml" is not working

[uni-3]

I trying this tutorial.

when create locus-master-controller. An error occurred.

kubectl create -f locust-master-controller.yaml
error: error validating "locust-master-controller.yaml": error validating data: [ValidationError(ReplicationController.spec.template.spec.containers[0].env[0]): unknown field "key" in io.k8s.kubernetes.pkg.api.v1.EnvVar, 

Maybe due to specification change of yaml file

[uni-3]

send pull request.
#20