Update dependency chai to ^4.2.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
chai	devDependencies	minor	^4.2.0	homepage, source

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Release Notes

chaijs/chai

v4.2.0

Compare Source

This is a minor release. Thank you to all of our contributors and users!

New Features

• feat(assertions): add 'still' language chain (#​1194; @​ScottRudiger)
• .lengthOf for Maps and Sets (#​1110, #​1131; @​asbish)
• feat: Add the assert.fail([message]) interface (#​1116, #​1117; @​s-leroux)

Bug Fixes

• fix: remove Chai frames from .deep.equal stack (#​1124; @​meeber)
• add 'catch' keyword to proxyExcludedKeys (#​1050, #​1101; @​generalandrew)
• property assertion should only accept strings if nested (#​1043, #​1044; @​solodynamo)
• fix: Make tests pass with --use_strict (#​1034, #​1040; @​shvaikalesh)

Performance

• perf: Optimize proxify and stringDistance (#​1098; @​sophiebits)
• fix: Avoid repeated String#slice calls in stringDistance (#​1095; @​bmeurer)

Style

• Fix typos and remove trailing whitespaces (#​1042; @​simonewebdesign)
• Remove unnecessary code (#​1049; @​abetomo)
• Fix variable declaration (#​1048; @​abetomo)

Tests

• test(assert): increase coverage (#​1084, #​1085; @​brutalcrozt)
• test: stop modifying globals in Proxy tests (#​1144; @​meeber)

Docs

• Fix unbalanced quotes in assert.notInclude example (#​1200; @​haykam821)
• docs: fix bad .string example (#​1156, #​1157; @​meeber)
• fixed package npm url (#​1151; @​wadie)
• Spelling (#​1145; @​jsoref)
• docs: corrected spelling (#​1141; @​Powell-v2)
• docs: fix wrong .property chaining examples (#​193 (comment), #​1130; @​meeber)
• docs: improve throws examples (#​1113; @​ColinEberhardt)
• Fix typos (#​1107; @​tbroadley)
• docs: correct .ok description (#​1047; @​shvaikalesh)

Chores

• chore: update package-lock.json (#​1198; @​meeber)
• Update mocha to the latest version (#​1127)
• chore: update dependencies (#​1157; @​meeber)
• Update browserify to the latest version (#​1135)
• chore: update Node versions in Travis config (#​1126; @​meeber)
• chore: remove Opera from Sauce config (#​1125; @​meeber)
• chore: update dependencies (#​1118; @​meeber)
• chore: update dependencies (#​1074; @​meeber)
• Chore: change coverage service (coverall to codecov) (#​927, #​1073; @​brutalcrozt)
• chore: add package-lock.json (#​1013; @​meeber)

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