Update dependency chai to version 4.x

[renovate-bot]

This Pull Request updates dependency chai from version 3.5.0 to 4.0.1

Changelog

4.0.1 / 2017-05-31

• fix: (#978) remove browser field (#982)
  This removes the browser field which was used incorrectly. It is not needed for chai, and bundlers should bundle the commonjs code instead.
• Update supported node version badge in README FIX #975

4.0.0 / 2017-05-26

• Merge pull request #973 from chaijs/chore-uncomment-travis-deploy
  chore: uncomment travis lines
• chore: uncomment travis lines
  This allows us to release on tags, for the upcoming 4.0
• Merge pull request #972 from lucasfcosta/release-4.0.0
  Release chai@4.0.0
• chai@4.0.0
• Merge pull request #967 from lucasfcosta/remove-lib-bump
  Remove bump command to change lib/chai.js
• Remove bump command to change lib/chai.js
• Merge pull request #964 from zetamorph/assert-nestedInclude-ownInclude
  assert: add nestedInclude, deepNestedInclude, ownInclude and deepOwnInclude
• fix: PhantomJS 1.x incompatibility (#966)
• Assert: made documentation more descriptive
  Assert: made documentation more descriptive
• test: added custom message test to negated .nested-, .deep-, .own.include
• test: added message argument to negated nested-, deep-, own- and deepOwnInclude
• assert interface: add .deepOwnInclude and notdeepOwnInclude
• assert interface: add .ownInclude and .notOwnInclude
• assert interface: add deepNestedInclude and notDeepNestedInclude
• assert interface: add nestedInclude and notNestedInclude
• test: add assert.deepOwnInclude and assert.notDeepOwnInclude
• test: add assert.deepNestedInclude and assert.notDeepNestedInclude
• test: add assert.ownInclude and assert.notOwnInclude
• test: add assert.nestedInclude and assert.notNestedInclude

[codecov-io]

Codecov Report

Merging #219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   73.74%   73.74%           
=======================================
  Files          19       19           
  Lines        1093     1093           
  Branches      211      211           
=======================================
  Hits          806      806           
  Misses        287      287

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