Revert 654b4e5 (#911)

Author: kfcampbell

github/resource_github_repository.go

@@ -207,9 +207,6 @@ 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,