Merge pull request kubernetes-sigs#771 from mengqiy/lens

✨ add a flag for the leader election feature

Merge pull request kubernetes-sigs#768 from droot/running/use-cr-ct-0…

….2.0-beta.2-releases

🏃 use latest beta releases of cr/ct

v2.0.0-alpha.2 release

v2.0.0-alpha.1 release

v2.0.0-alpha.0 release

Merge pull request kubernetes-sigs#579 from droot/running/cloud-build…

…-k8s-1.13.1

🏃 updated k8s version to 1.13.1 in build scripts

Merge pull request kubernetes-sigs#537 from mengqiy/usegcr

use gcr auth proxy image

Merge pull request kubernetes-sigs#523 from mengqiy/k8s_tools

update how to build tools for kubebuilder

Merge pull request kubernetes-sigs#445 from droot/bugfix/go-version-c…

…heck-fix

improved Go version check

kubebuilder v1.0.4