Handle `no file or directory` UnhandledPromiseRejectionWarning

[Vadim Nechaev]

Hey. Thank you for the package. It's a great thing and an oportunity to reduce time to compare images.

Could you please add handling an error when no file found in the baseline directory?

For now I get UnhandledPromiseRejectionWarning, but I would be happy to get it via the result object. Something like this.

result: { match: false, reason: 'ENOENT: no such file or directory', details: filepath }

[Vadim Nechaev]

Thb I'm not so confident in coding to get it done by myself and contribute, that's why I'm asking you about this.

[Vadim Nechaev]

Thank you.