📖 use v2.2.0 in quick start

docs/book/src/quick-start.md

@@ -9,7 +9,7 @@ This Quick Start guide will cover:
 
 ## Prerequisites
 
-- [go](https://golang.org/dl/) version v1.12+.
+- [go](https://golang.org/dl/) version v1.13+.
 - [docker](https://docs.docker.com/install/) version 17.03+.
 - [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) version v1.11.3+.
 - [kustomize](https://sigs.k8s.io/kustomize/docs/INSTALL.md) v3.1.0+
@@ -24,11 +24,11 @@ os=$(go env GOOS)
 arch=$(go env GOARCH)
 
 # download kubebuilder and extract it to tmp
-curl -sL https://go.kubebuilder.io/dl/2.1.0/${os}/${arch} | tar -xz -C /tmp/
+curl -sL https://go.kubebuilder.io/dl/2.2.0/${os}/${arch} | tar -xz -C /tmp/
 
 # move to a long-term location and put it on your path
 # (you'll need to set the KUBEBUILDER_ASSETS env var if you put it somewhere else)
-sudo mv /tmp/kubebuilder_2.1.0_${os}_${arch} /usr/local/kubebuilder
+sudo mv /tmp/kubebuilder_2.2.0_${os}_${arch} /usr/local/kubebuilder
 export PATH=$PATH:/usr/local/kubebuilder/bin
 ```