improved error logging

[wardviaene]

It's nicer to have just the error and an exit 1, rather than a panic. Great utility otherwise! 👍

[orfin]

Thanks for contribution @wardviaene !

Just wondering:

1. Why this change is needed? We are invoking Panic as this is an error that is unexpected and must stop the rest of application flow.
2. Is it possible to omit if statement and just do log.println(err)?
3. Why not log.Fatal?

[orfin]

@wardviaene ping :-)

[wardviaene]

1. How I understand, panic() should be used when there's something wrong in the the code/library, not when an external factor influences the run of an application. It's nicer to have the exact error returned with an exit code of 1.
2. Indeed, it's only when you'd want to return different messages / codes for different scenarios
3. log.Fatal seems to be a better choice indeed, also does os.Exit(1)