docs: Specify known working versions

There are known issues with the current latest versions of helm and minikube
which is causing failures for new users trying to deploy zenko on minikube and
therefore explicitly declaring known working versions for future reference.

Issues with new versions of minikube
kubernetes/minikube#2765
Issues with new versions of helm
helm/helm#3991

charts/minikube.md

@@ -1,14 +1,15 @@
 ### Requirements
 - [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
-- [minikube](https://github.com/kubernetes/minikube/#installation)
+- [minikube](https://github.com/kubernetes/minikube/#installation) v0.25
   - [virtualbox](https://www.virtualbox.org/wiki/Downloads)
-- [helm](https://github.com/kubernetes/helm#install)
+- [helm](https://github.com/kubernetes/helm#install) v2.8.2
 - [git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
 
 The following assumes you have minikube (which requires virtualbox or other virtualization options),
 kubectl, and helm installed (see links above). Once minikube, kubectl, and helm are installed, 
 start minikube with at least version 1.9 of kubernetes and perferably with 4GB of RAM (although the
 default value of 2GB should work, we recommend 4GB or more) and enable the minikube ingress addon for communication.
+#### NOTE the listed versions are known to be working properly as some edge release versions may have issues properly deploying
 ```shell
 minikube start --kubernetes-version=v1.9.0 --memory 4096
 minikube addons enable ingress