Update polyfilling with core-js#363
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Problem
core-js@2is obsolete and pollutes the global namespace@babel/preset-env'scorejs: 3option includescore-js@3and its polyfills pollute the global namespace too@babel/plugin-transform-runtime'scorejs: 3option includescore-js-pure@3which does not pollute the global namespace but polyfills everything regardless of the targets specified by preset-env.Would also resolve #342
Solution
By using the new Babel Polyfills we can include modern and pure polyfills based on the targets config (none is specified in twitter-text so it will use the default) in the root of babel config.