fix(r/repository): suppress etag changes (#909)

/cc #796

Author: Jeremy Udit

github/resource_github_repository.go

@@ -207,6 +207,9 @@ func resourceGithubRepository() *schema.Resource {
 			"etag": {
 				Type:     schema.TypeString,
 				Computed: true,
+				DiffSuppressFunc: func(k, old, new string, d *schema.ResourceData) bool {
+					return true
+				},
 			},
 			"template": {
 				Type:     schema.TypeList,