IMPROVEMENTS:
- resource/digitalocean_kubernetes_cluster: Enable auto_upgrade on Kubernetes clusters (#237). Thanks to @lfarnell!
- resource/digitalocean_kubernetes_cluster: Add support for surge upgrades (#465). Thanks to @varshavaradarajan!
BUG FIXES:
- resource/digitalocean_container_registry_docker_credentials: Update default expiry and don't ignore error (#467).