Document how to use the kind tool and the Tekton/plumbing convenience script

Author: mrutkows

DEVELOPMENT.md

@@ -266,7 +266,7 @@ The recommended minimum development configuration is:
 
 <!-- TODO: Someone needs to validate the cluster-version-->
 1. Create a GKE cluster (with `--cluster-version=latest` but you can use any
-    version 1.17 or later):
+    version 1.18 or later):
 
     ```bash
     export PROJECT_ID=my-gcp-project
@@ -284,7 +284,7 @@ The recommended minimum development configuration is:
      --machine-type=n1-standard-4 \
      --image-type=cos \
      --num-nodes=1 \
-     --cluster-version=1.17
+     --cluster-version=1.18
     ```
 
     > **Note**: The recommended [GCE machine type](https://cloud.google.com/compute/docs/machine-types) is `'n1-standard-4'`.