Update chai to version 3.4.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

chai just published its new version 3.4.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of chai – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 26 commits .

• 71b2512 chai@3.4.0
• 1b2c648 Merge pull request #538 from tusbar/tusbar/revert-499
• 8c1d8cf Revert .empty assertion change from PR #499
• 6472cb9 Merge pull request #534 from Droogans/be-oneOf-assertion
• b474cee feat(matchers): Allow for objects in oneOf
• 179d470 feat(matchers): Add value-in-list assertion
• db21e48 docs(contributing): Highlight test steps
• 73122c5 Merge pull request #533 from astorije/patch-2
• 547e637 Fix tpyo
• da87695 Merge pull request #529 from dxuehu/fix/assertLengthOfDocs
• 7c14c15 Fix assert lengthOf example
• 6d0ae35 Merge pull request #527 from cjqed/should-approximately
• 7fe23e9 Added approximately alias to close to
• 7f5a108 Merge pull request #446 from danielbprice/master
• 22fbd65 Merge pull request #522 from austinpray/spelling

There are 26 commits in total. See the full diff.

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