Add shebang for ecs.py (#950)

I know this is trivial, but the Debian QA tools get slightly grumpy when there's no shebang for an executable script, so it would make things slightly easier for me if you would add this.

Thanks,

Scott K

diff --git a/examples/ecs.py b/examples/ecs.py
index d5a84f24b4394dacb70436456149bc52bffb3c94..03a16bbf6fa1ff6f836b310181debaa89767bdf1 100755 (executable)
--- a/examples/ecs.py
+++ b/examples/ecs.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import dns.edns
 import dns.message
 import dns.query