Fix formatting for long default values.

[alecthomas]

Flags:
  --help                                                                      Show help.
  --bind=127.0.0.1:8239                                                       Host and port to bind service to.
  --log-level=info                                                            Set the default log level.
  --log-file=PATH                                                             Enable file logging to PATH.
  --log-stderr                                                                Log to stderr (defaults to true).
  --debug                                                                     Enable debug mode.
  -p, --pid-file=/var/folders/sj/cq5qhlq11p1537yg0pp21pb80000gn/T/sbusd.pid   Write PID file to PATH.
  -d, --daemonize                                                             Daemonize the process.