terraform.tf in gce-host-0.5.2 vs terraform.tf in gce-host-0.5.3

@@ -1,6 +1,6 @@
 provider "google" {
-  credentials = "${file("terraform.json")}"
+  credentials = "${file("service_account.json")}"
   region = "asia-northeast1"
 }
 
 resource "google_compute_instance" "gce-host-web" {
   name         = "gce-host-web"