It's time to bump the major version on Redux! 🎉 This is the first beta release of 4.0.0. Despite the version bump, the changes are relatively minor. Most of it was covered in the 4.0 tracking issue: #1342. The largest amount of work was done with our Typescript definitions. They have been completely overhauled, so they should work better and take advantage of all the new stuff in TS 2.x. The othe