No warning shows up when an unknown command is passed in

[jamesgeorge007]

Expected output

happo <junkcmd>

Invalid command a

Usage: happo [options]

Options:
  -V, --version            output the version number
  -c, --config <path>      set config path (default: "./.happo.js")
  -o, --only <component>   limit to one component
  -l, --link <url>         provide a link back to the commit
  -m, --message <message>  associate the run with a message (e.g. commit subject)
  -a, --author <email>     the author of the commit
  --debug-port <port>      the port where the debug server listens
  --debug-port <port>      the port where the debug server listens
  --dry-run                makes the `happo compare` call non-destructive when running with a `compareThreshold` config option
  -h, --help               output usage information

Commands:
  run [sha]                execute a full happo run
  dev                      start dev mode
  debug                    start a local server where you can debug happo examples
  has-report <sha>         check if there is a report for a specific sha
  empty <sha>              mark a report as empty
  compare <sha1> <sha2>    compare reports for two different shas
  start-job <sha1> <sha2>  start a job (used by happo-ci script)