Warning: Quoted type constraints are deprecated

[miparnisari]

terraform init yields this:

Warning: Quoted type constraints are deprecated

  on .terraform/modules/tf_registry/variables.tf line 12, in variable "name_prefix":
  12:   type        = "string"

Terraform 0.11 and earlier required type constraints to be given in quotes,
but that form is now deprecated and will be removed in a future version of
Terraform. To silence this warning, remove the quotes around "string".

[miparnisari]

#2