message: add final linebreak to cargo default help message.
diff: @@ -134,7 +134,7 @@ Some common cargo commands are (see all commands with --list):
  install Install a Rust binary
  uninstall Uninstall a Rust binary
  -See 'cargo help <command>' for more information on a specific command.",
  +See 'cargo help <command>' for more information on a specific command.\n",
  )
  .arg(opt("version", "Print version info and exit").short("V"))
  .arg(opt("list", "List installed commands"))
  