Update readme version and add notice about path deprecation

Signed-off-by: Radu M <root@radu.sh>

Author: Radu M

README.md

@@ -1,63 +1,79 @@
 # @engineerd/setup-kind
 
-Setup [KinD (Kubernetes in Docker)](https://kind.sigs.k8s.io/) with a single GitHub Action!
+Setup [KinD (Kubernetes in Docker)](https://kind.sigs.k8s.io/) with a single
+GitHub Action!
 
-> This action assumes a Linux environment, and will _not_ work on Windows or MacOS agents.
+> Because of a [deprecation in the GitHub Actions environment][gh-actions-path],
+> versions lower than v0.5.0 will no longer work properly. See [this
+> issue][path-issue] for more details.
 
-```
+> This action assumes a Linux environment, and will _not_ work on Windows or
+> MacOS agents.
+
+```yaml
 name: "Create cluster using KinD"
 on: [pull_request, push]
 
 jobs:
   kind:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
-    - uses: engineerd/setup-kind@v0.4.0
-    - name: Testing
-      run: |
-        kubectl cluster-info
-        kubectl get pods -n kube-system
-        echo "current-context:" $(kubectl config current-context)
-        echo "environment-kubeconfig:" ${KUBECONFIG}
+      - uses: actions/checkout@master
+      - uses: engineerd/setup-kind@v0.5.0
+      - name: Testing
+        run: |
+          kubectl cluster-info
+          kubectl get pods -n kube-system
+          echo "current-context:" $(kubectl config current-context)
+          echo "environment-kubeconfig:" ${KUBECONFIG}
 ```
 
-> Note: KUBECONFIG is automatically merged after cluster creation starting with version 0.6 of Kind. See [this document for a detailed migration guide][kind-kubeconfig]
+> Note: KUBECONFIG is automatically merged after cluster creation starting with
+> version 0.6 of Kind. See [this document for a detailed migration
+> guide][kind-kubeconfig]
 
 > Note: GitHub Actions workers come pre-configured with `kubectl`.
 
-The following arguments can be configured on the job using the `with` keyword (see example above).
-Currently, possible inputs are all the flags for `kind cluster create`, with the additional version, which sets the Kind version to downloadm and `skipClusterCreation`, which when present, skips creating the cluster (the Kind tools is configured in the path).
+The following arguments can be configured on the job using the `with` keyword
+(see example above). Currently, possible inputs are all the flags for
+`kind cluster create`, with the additional version, which sets the Kind version
+to downloadm and `skipClusterCreation`, which when present, skips creating the
+cluster (the Kind tools is configured in the path).
 
 Optional inputs:
 
 - `version`: version of Kind to use (default `"v0.7.0"`)
-- `config`: path (relative to the root of the repository) to a kind config file. If omitted, a default 1-node cluster will be created
+- `config`: path (relative to the root of the repository) to a kind config file.
+  If omitted, a default 1-node cluster will be created
 - `image`: node Docker image to use for booting the cluster.
 - `name`: cluster context name (default `"kind-kind"`)
 - `wait`: wait for control plane node to be ready (default `"300s"`)
-- `skipClusterCreation`: if `"true"`, the action will not create a cluster, just acquire the tools
+- `skipClusterCreation`: if `"true"`, the action will not create a cluster, just
+  acquire the tools
 
 Example using optional inputs:
 
-```
+```yaml
 name: "Create cluster using KinD"
 on: [pull_request, push]
 
 jobs:
   kind:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
-    - uses: engineerd/setup-kind@v0.4.0
-      with:
+      - uses: actions/checkout@master
+      - uses: engineerd/setup-kind@v0.5.0
+        with:
           version: "v0.7.0"
-    - name: Testing
-      run: |
-        kubectl cluster-info
-        kubectl get pods -n kube-system
-        echo "current-context:" $(kubectl config current-context)
-        echo "environment-kubeconfig:" ${KUBECONFIG}
+      - name: Testing
+        run: |
+          kubectl cluster-info
+          kubectl get pods -n kube-system
+          echo "current-context:" $(kubectl config current-context)
+          echo "environment-kubeconfig:" ${KUBECONFIG}
 ```
 
 [kind-kubeconfig]: https://github.com/kubernetes-sigs/kind/issues/1060
+[gh-actions-path]:
+  https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
+[path-issue]: https://github.com/engineerd/setup-kind/issues/28