Kured 1.4.0

This release adds support for newer k8s client tools and updates other internal build components.

Improvements

• Update Alpine base image (#114)
• We're in the #kured channel on Slack (#118)
• We're having monthly meetings (#126)
• Updated kubectl, client-go, etc to k8s 1.17 (#127, #135)
• Update to go 1.13 (#130)
• Unpin specific Alpine image (#131)
• print node id when commanding reboot (#134)
• Update compatbility matrix (#133)
• Check links as part of CI (#138)

Thanks a lot everyone who helped with this release, in particular @crgarcia12, @dholbach, @evrardjp, @pgroene and others who helped with testing!

Kubernetes Version Compatibility

The daemon image contains a 1.17.x k8s.io/client-go and kubectl binary for the purposes of maintaining the lock and draining worker nodes. Kubernetes aims to provide forwards & backwards compatibility of one minor version between client and server, so this should work on 1.1[678].x.

Tested in minikube on 1.16.9, 1.17.5, 1.18.2.