Adding sideEffects: false to package.json

[neoncube2]

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Feature Request

A while back, I asked to add "sideEffects": false to this package's package.json file, to enable better tree shaking: #136

Anyway, I've found another reason that it might make sense to add this flag, which is that without it, if this module is imported but unused, its code still gets bundled.

See my comment at eugenezinovyev/react-fontawesome-svg-icon#36 (comment) for a more detailed explanation.

I'd reopen #136, but it says I don't have permissions XD

Thanks :)