Update dependency should to ^8.4.0

[ghost]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
should	^8.0.2 -> ^8.4.0

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Release Notes

shouldjs/should.js (should)

v8.4.0

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• Add support for Symbols in .eql

v8.3.2

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• Fix for should-equal to do not call .toString when checking circular usage

v8.3.1

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• Fix browser script to again be UMD bundle

v8.3.0

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• .true() and .false() can accept optional message to be used in assertion Error
• Add more useful messages to promise assertions

v8.2.2

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• Fix bug with .match when called primitive to match object
• Various linting issues

v8.2.1

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• Fix bug with new option, thanks @​VinGarcia

v8.2.0

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• Add option to should.equal to treat -0 and +0 as equals

v8.1.1

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• Fix browser build to do not loose window.Should

v8.1.0

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• Add .Date() assertion to test if given object is Date instance

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