update drone.yml

drone.yml

@@ -28,7 +28,7 @@ steps:
     #mirror: registry-1.docker.io/library/debian:stable-slim
     bip: 172.17.0.1/16
     context: /drone # defaults to root of git repo
-    #custom_dns: 127.0.0.11
+    custom_dns: 127.0.0.11
     storage_driver: overlay2 # aufs, overlay or vfs
     debug: true
     launch_debug: true