Upgrade to Babel 7 and Rollup 1.0 and generate updated build. #213
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Rollup 1.0 was recently released. I took this opportunity to update the build tools to use Babel 7, Rollup 1.0, and newer versions of Jest and eslint which work with those updates.
I removed the babel-preset-stage-3 dependency as it's deprecated in Babel 7 and using
@babel/preset-env
and @babel/plugin-external-helpers` should provide the needed assistance for supported browsers.