Release a revised set of Alpine Linux AMIs, including...
* improved nvme-ebs-links mdev script (issue #40)
* start haveged at boot runlevel (issue #39)
* Release Alpine Linux 3.9.0 AMIs
* Update README.md and release.yaml with a fresh batch of 3.9.0 AMIs
* Append GitHub project link to AMI description
* really minor caveat fix