Return non-zero exit code if raco pollen subcommand is unrecognized #177

Hi,

Currently, an invalid sub-command such as raco pollen publsih seems to return an exit code 0 to the shell. Can you please change it so that it returns a non-zero value.

This is quite useful when wrapping pollen command in a shell script or other racket programs.

Thank you

Hi, Currently, an invalid sub-command such as `raco pollen publsih` seems to return an exit code `0` to the shell. Can you please change it so that it returns a non-zero value. This is quite useful when wrapping pollen command in a shell script or other racket programs. Thank you

Consistent with other raco commands, it will return 1 for an invalid argument.

Consistent with other `raco` commands, it will return `1` for an invalid argument.

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Return non-zero exit code if raco pollen subcommand is unrecognized #177