Update chai to version 4.0.1 🚀

[greenkeeperio-bot]

🚨🔥⚠️ Action required: Switch to the new Greenkeeper now! 🚨🔥⚠️
This version of Greenkeper will be shutdown on May 31st.
With Integrations first-class bot support landed on GitHub and we’ve rewritten Greenkeeper to take full advantage of it. Simpler setup, fewer pull-requests, faster than ever.

---

Hello lovely humans,

chai just published its new version 4.0.1.

State	Update 🚀
Dependency	chai
New version	4.0.1
Type	devDependency

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 chai.
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!

🌴

---

The new version differs by 352 commits .

• b38b8d7 fix: (#978) remove browser field (#982)
• d0ace69 Update supported node version badge in README FIX #975
• ab1fbad Merge pull request #973 from chaijs/chore-uncomment-travis-deploy
• 545ca2f chore: uncomment travis lines
• 6349ff4 Merge pull request #972 from lucasfcosta/release-4.0.0
• 0fe98b1 [email protected]
• 30a4451 Merge pull request #967 from lucasfcosta/remove-lib-bump
• 8ba95a7 Remove bump command to change lib/chai.js
• 0825826 Merge pull request #964 from zetamorph/assert-nestedInclude-ownInclude
• f3adfd9 fix: PhantomJS 1.x incompatibility (#966)
• b744130 Assert: made documentation more descriptive
• 33e4403 test: added custom message test to negated .nested-, .deep-, .own.include
• 4180242 test: added message argument to negated nested-, deep-, own- and deepOwnInclude
• 40bb490 assert interface: add .deepOwnInclude and notdeepOwnInclude
• 97b6243 assert interface: add .ownInclude and .notOwnInclude

There are 250 commits in total. See the full diff.