v3.0.2

Bugfix

• Mysteriously library still wasn't working with create-react-app@2 presumably because CRA@2 started to apply babel transforms to node_modules, my guess is something in how microbundle creates bundles and how CRA + babel parses them breaks the library. It was really hard to track, so the short-term solution is to change the build process to use Rollup + babel 7 instead of microbundle #109