Update react-dom to version 15.4.0 🚀

[greenkeeperio-bot]

Hello lovely humans,

react-dom just published its new version 15.4.0.

State	Update 🚀
Dependency	react-dom
New version	15.4.0
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of react-dom.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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GitHub Release

React

• React package and browser build no longer "secretly" includes React DOM. (@sebmarkbage in #7164 and #7168)
• Required PropTypes now fail with specific messages for null and undefined. (@chenglou in #7291)
• Improved development performance by freezing children instead of copying. (@keyanzhang in #7455)

React DOM

• Fixed occasional test failures when React DOM is used together with shallow renderer. (@goatslacker in #8097)
• Added a warning for invalid aria- attributes. (@jessebeach in #7744)
• Added a warning for using autofocus rather than autoFocus. (@hkal in #7694)
• Removed an unnecessary warning about polyfilling String.prototype.split. (@nhunzaker in #7629)
• Clarified the warning about not calling PropTypes manually. (@jedwards1211 in #7777)
• The unstable batchedUpdates API now passes the wrapped function's return value through. (@bgnorlov in #7444)
• Fixed a bug with updating text in IE 8. (@mnpenner in #7832)

React Perf

• When ReactPerf is started, you can now view the relative time spent in components as a chart in Chrome Timeline. (@gaearon in #7549)

React Test Utils

• If you call Simulate.click() on a <input disabled onClick={foo} /> then foo will get called whereas it didn't before. (@nhunzaker in #7642)

React Test Renderer

• Due to packaging changes, it no longer crashes when imported together with React DOM in the same file. (@sebmarkbage in #7164 and #7168)
• ReactTestRenderer.create() now accepts {createNodeMock: element => mock} as an optional argument so you can mock refs with snapshot testing. (@Aweary in #7649, #8261)

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