v0.18.0

fix: use short hostname for dns record @syphernl (#53)

what

• Add a host_name variable to revert the namechange introduced in v0.17.0.

why

• Since v0.17.0 context is being passed to the route53-cluster-hostname module, which results in the hostname to be changed to the value of module.this.id (namespace-env-bastion) rather than bastion

references

• As similarly applied to terraform-aws-rds