Update README

[aleksasiriski]

Hey man, great work with this tool. Just wanted to let you know that the link you provide for custom images doesn't work: https://github.com/kube-hetzner/packer-hcloud-microos

I contribute to the project but I don't know exactly when and why that repo was removed, but my guess is when v2 released which incorporated that inside the main project repo. I will try to find the source from it and bring it back for you but when that is done it's probably best you keep a fork just in case.

[vitobotta]

Hi @aleksasiriski and thanks a lot for letting me know! I had no idea. If you can find where this is at now it would be great :)