Try to fix App Engine costs rising lately

Bug: misc:55
GitOrigin-RevId: fd8a9fc76e96c018c5e922a754d01abf3a0bcc7e
diff --git a/app.yaml b/app.yaml
index 9cc0be0..4188a32 100644
--- a/app.yaml
+++ b/app.yaml
@@ -13,7 +13,7 @@
 automatic_scaling:
   min_pending_latency: 15000ms
   max_pending_latency: 15000ms
-  min_instances: 1
+  min_instances: 0
   max_instances: 1
   max_concurrent_requests: 80