Add Diff Suppression Option To repository_collaborator (#683)

* add diff suppression option to `repository_collaborator`

* fixup! remove comment

* remove hardcoded username from test

Author: Jeremy Udit

examples/repository_collaborator/README.md

@@ -7,15 +7,15 @@ This example will also create a repository in the specified `owner` organization
 Alternatively, you may use variables passed via command line:
 
 ```console
-export GITHUB_ORG=
+export GITHUB_ORGANIZATION=
 export GITHUB_TOKEN=
 export COLLABORATOR_USERNAME=
 export COLLABORATOR_PERMISSION=
 ```
 
 ```console
 terraform apply \
-  -var "organization=${GITHUB_ORG}" \
+  -var "organization=${GITHUB_ORGANIZATION}" \
   -var "github_token=${GITHUB_TOKEN}" \
   -var "username=${COLLABORATOR_USERNAME}" \
   -var "permission=${COLLABORATOR_PERMISSION}"

examples/repository_collaborator/providers.tf

@@ -1,5 +1,4 @@
 provider "github" {
-  version      = "2.8.0"
   organization = var.organization
   token        = var.github_token
 }

github/resource_github_repository_collaborator.go

@@ -15,6 +15,7 @@ func resourceGithubRepositoryCollaborator() *schema.Resource {
 	return &schema.Resource{
 		Create: resourceGithubRepositoryCollaboratorCreate,
 		Read:   resourceGithubRepositoryCollaboratorRead,
+		Update: resourceGithubRepositoryCollaboratorUpdate,
 		Delete: resourceGithubRepositoryCollaboratorDelete,
 		Importer: &schema.ResourceImporter{
 			State: schema.ImportStatePassthrough,
@@ -39,6 +40,19 @@ func resourceGithubRepositoryCollaborator() *schema.Resource {
 				ForceNew:     true,
 				Default:      "push",
 				ValidateFunc: validateValueFunc([]string{"pull", "triage", "push", "maintain", "admin"}),
+				DiffSuppressFunc: func(k, old, new string, d *schema.ResourceData) bool {
+					if d.Get("permission_diff_suppression").(bool) {
+						if new == "triage" || new == "maintain" {
+							return true
+						}
+					}
+					return false
+				},
+			},
+			"permission_diff_suppression": {
+				Type:     schema.TypeBool,
+				Optional: true,
+				Default:  false,
 			},
 			"invitation_id": {
 				Type:     schema.TypeString,
@@ -158,6 +172,10 @@ func resourceGithubRepositoryCollaboratorRead(d *schema.ResourceData, meta inter
 	return nil
 }
 
+func resourceGithubRepositoryCollaboratorUpdate(d *schema.ResourceData, meta interface{}) error {
+	return resourceGithubRepositoryCollaboratorRead(d, meta)
+}
+
 func resourceGithubRepositoryCollaboratorDelete(d *schema.ResourceData, meta interface{}) error {
 	client := meta.(*Owner).v3client