Removes the broken jsnext:main. It is supposed to point to the ES module build but we mistakingly pointed it to the src, so it never worked for anyone anyway. For now, we don’t provide an ES module build in React Redux, so if you use Rollup, you need to use the CommonJS plugin for it. Realistically, it doesn’t make a big difference because React Redux assumes you use React anyway (which uses CommonJS), and it also doesn’t benefit from tree shaking because there are only two exports (connect and <Provider>) and you will need both pretty much any time.