Remove verbose log line.

server.pl

@@ -270,7 +270,6 @@ handle_post(Request) :-
         JSON = _{error: "invalid_json"}
     ),
     format('Content-type: application/json~n~n'),
-    format(user_error, 'Received POST request with JSON data: ~w~n', [JSON]),
     CommitBefore = JSON.before,
     CommitAfter = JSON.after,
     Repository = JSON.repository.full_name,