Update README.md

README.md

@@ -68,6 +68,7 @@ You can issue certificates in exchange for:
 - [Cloud instance identity documents](https://smallstep.com/blog/embarrassingly-easy-certificates-on-aws-azure-gcp/), for VMs on AWS, GCP, and Azure
 - [Single-use, short-lived JWK tokens](https://smallstep.com/docs/step-ca/provisioners#jwk) issued by your CD tool — Puppet, Chef, Ansible, Terraform, etc.
 - A trusted X.509 certificate (X5C provisioner)
+- A host certificate from your Nebula network
 - A SCEP challenge (SCEP provisioner)
 - An SSH host certificates needing renewal (the SSHPOP provisioner)
 - Learn more in our [provisioner documentation](https://smallstep.com/docs/step-ca/provisioners)