Release v0.3.0

[dghubble]

Release notes (draft):

• Add support for before-reboot and after-reboot required annotations (#121)
  • Allow setting update-operator required --before-reboot-annotations and --after-reboot-annotations
  • Add before-reboot label before reboots and add after-reboot label after reboot (but before schedulable)
• Auto-label Container Linux nodes with agent=true for backwards compatibility (#117)
  • Set --auto-label-container-linux=true to enable Container Linux labeling
• Add docs on CLUO labels and annotations (#123)
• Add docs and examples of before-reboot and after-reboot DaemonSet (#124)

Image is located at quay.io/coreos/container-linux-update-operator:v0.3.0

[dghubble]

:+1: