* Relax fixed 0.1.2 version constraint to "~> 0.1.2", which allows 0.1.3, 0.1.4, etc, but would not allow 0.2.0
* Constrains ~> 1.0 means users can use 1.0.1, 1.1, but not 2.0 * https://www.terraform.io/docs/configuration/terraform.html
* Bump minimum Terraform version to v0.10.4 * Allow minor version updates for 1.0+ plugins * Fix versions for plugins which are pre-1.0