Update happypack to the latest version 🚀

[greenkeeper]

Version 4.0.0 of happypack just got published.

Dependency	happypack
Current Version	3.1.0
Type	devDependency

The version 4.0.0 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 happypack.
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.

---

Commits

The new version differs by 32 commits.

• c93d33d Release 4.0.0-beta.5
• e86e33c make it work with cache-loader
• c99b827 Release 4.0.0-beta.4
• 13612f8 set default bufferedMessaging in ThreadPool
• 35947c0 provide correct args for process.send() on node 4
• f66a613 buffer process.send() calls on Windows
• 009581d Correct link to TS example
• 50fbd32 Release 4.0.0-beta.2
• 54fb685 Update and run all examples against webpack 1,2,3
• 593503b Specify chai as dep of test utils
• eeeb6a0 Specify dependencies of tests
• c8ae100 Update npm ignores
• c7235f2 Move test utils to their own package
• 6dac270 Run tests against webpack 1, 2, and 3
• 3dfc59f serialize errors in emitWarning and emitError

There are 32 commits in total.

See the full diff

Not sure how things should work exactly?

There is a collection of frequently asked questions and of course you may always ask my humans.

---

Your Greenkeeper Bot 🌴

[coveralls]

Coverage increased (+4.1%) to 88.601% when pulling 264bde8 on greenkeeper/happypack-4.0.0 into cfe808a on master.