Instructions from `VerneMQ on Kubernetes` don't work on GKE

[dunyakirkali]

I'm trying to install VerneMQ on GKE using the method suggested on VerneMQ on Kubernetes

However I get the following error:

$ curl -L https://codeload.github.com/vernemq/vmq-operator/zip/master --output repo.zip; \
> unzip -j repo.zip '*/examples/only_vernemq/*' -d only_vernemq; \
> kubectl apply -f only_vernemq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  209k    0  209k    0     0   183k      0 --:--:--  0:00:01 --:--:--  183k
Archive:  repo.zip
b06ea91fccbbc537482a8148c8eb421e3bb7bc8d
replace only_vernemq/0vernemq-operator-0namespace.yaml? [y]es, [n]o, [A]ll, [N]one, [r]ename: A
  inflating: only_vernemq/0vernemq-operator-0namespace.yaml
  inflating: only_vernemq/0vernemq-operator-0vernemqCustomResourceDefinition.yaml
  inflating: only_vernemq/0vernemq-operator-deployment.yaml
  inflating: only_vernemq/0vernemq-operator-role.yaml
  inflating: only_vernemq/0vernemq-operator-roleBinding.yaml
  inflating: only_vernemq/0vernemq-operator-serviceAccount.yaml
  inflating: only_vernemq/vernemq-service.yaml
  inflating: only_vernemq/vernemq-serviceAccount.yaml
  inflating: only_vernemq/vernemq-vernemq.yaml
namespace/messaging created
customresourcedefinition.apiextensions.k8s.io/vernemqs.vernemq.com created
role.rbac.authorization.k8s.io/vmq-operator created
rolebinding.rbac.authorization.k8s.io/vmq-operator created
serviceaccount/vmq-operator created
service/vernemq-k8s created
serviceaccount/vernemq-k8s created
unable to recognize "only_vernemq/0vernemq-operator-deployment.yaml": no matches for kind "Deployment" in version "apps/v1beta2"
unable to recognize "only_vernemq/vernemq-vernemq.yaml": no matches for kind "VerneMQ" in version "vernemq.com/v1alpha1"

Are the docs outdated or am I doing something wrong?