Fix improperly configured error showing

[Kreeg]

Fixes #82

[Kreeg]

@XhmikosR I'm not sure how to proceed here
'node:utils' available after Node v14

[XhmikosR]

I suggest you just ignore the rule in package.json and we re-enable it after svg-sprite v3.0.0 where we drop support for Node.js < 14

[XhmikosR]

I assume you tested it, @Kreeg, right? I don't really use gulp or grunt a lot nowadays :)

I can make a new release after this is merged.

[Kreeg]

I changed svg-sprite package's file to throw errors and it seems to do well
There is some refactoring ahead in the main package. Sometime we throw formatted error like

 error = util.format('SVGSpriter.add: "%s" is not the local part of "%s"', name, file);

Sometimes we rely on winston logger, like

spriter.error('Optimizing "%s" with SVGO failed with error "%s"', shape.name, error);

I think these should be unified

[XhmikosR]

Your call, but I agree we should be consistent. BTW, if we could replace winston with something smaller that has the same features we currently use that would make more sense.

[Kreeg]

@XhmikosR hello. I think we're ready for new release.