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You state in the readme, that the required Node.js version is 8.0.0. This is not reflected in the "engines" property of the package.json, which states 6.9.0 is minimum version.
I assume the high version number is due to async/await which is enabled since Node.js v7.6. Therefore I adjusted the versions to 7.6.0. I tested the package with that version and it worked fine.
If v8.0.0 is still required let me know and I will adjust it.