Use rollup to build cjs&es modules

[hronro]

fix #13

[levrik]

I though tree shaking works only with ES modules?

[hronro]

I think the we still need to provide a entry file for who's build tools doesn't support es module syntax(e.g. webpack1, jest or use in Node.js directly), and then people can still use the same import useage (import { A, B } from 'mdi-react') which is more convenient than import A from 'mdi-react/A';import B from 'mdi-react/B'. And people can also use babel-plugin-import make tree-shaking available even with commonjs built.

[levrik]

I just published a new version under @levrik/mdi-react with the version number 3.0.0-build.1.
Could you try if it's working for you? I will publish it under the normal package if everything works fine 🙂

[hronro]

@levrik It works fine for me😄