Not compatible with react native

[thowar2]

https://github.com/bitchan/eccrypto/blob/ee2518544ca36849e4618907dea3c8e3a34a00b0/browser.js#L6

This causes errors when building in react-native.

RN friendly alternatives:

• https://github.com/kevlened/isomorphic-webcrypto
• https://github.com/LinusU/react-native-webcrypto

[JBaczuk]

Thanks for reporting, I think RN support is a good idea. I'll have to look into this more, want to pick a method that is well supported.