add "type": "module" to package.json

[mesqueeb]

I think it's time to take the leap : D

[snovakovic]

@mesqueeb First of all apologies for such a late reply!

I haven't add type module to package json but I did address runing of the library inside of ESM environment that should now work as expected (Addressing following issue #72)

Think that should also address this so will close issue but let me know if I'm missing something