Merge pull request #2024 from dlipovetsky/docs-tilt-kustomize-standalone

📖 Add kustomize standalone prereq to tilt doc

Author: k8s-ci-robot

docs/book/src/developer/tilt.md

@@ -10,6 +10,8 @@ workflow that offers easy deployments and rapid iterative builds.
 1. [Docker](https://docs.docker.com/install/)
 1. [kind](https://kind.sigs.k8s.io) v0.6 or newer
    (other clusters can be used if `preload_images_for_kind` is set to false)
+1. [kustomize](https://github.com/kubernetes-sigs/kustomize/blob/master/docs/INSTALL.md) standalone
+   (`kubectl kustomize` does not work because it is missing some features of kustomize v3)
 1. [Tilt](https://docs.tilt.dev/install.html)
 1. Clone the [Cluster API](https://github.com/kubernetes-sigs/cluster-api) repository locally
 1. Clone the provider(s) you want to deploy locally as well