Update should to version 8.1.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

should just published its new version 8.1.1, 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 should – 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 67 commits .

• 81e052a Merge branch 'master' of github.com:shouldjs/should.js
• 7427774 Release 8.1.1
• c2537e3 Expose previous window.Should property manually
• e743d1c Update .zuul.yml
• 3317731 Update promise.js
• 047bfe3 Update should.js
• 57a2013 Release 8.1.0
• 4ad9880 Merge pull request #95 from seegno-forks/enhancement/add-date-type-assertion
• c37ecf9 Add Date type assertion
• 24bcb15 Release 8.0.2
• 4a0dd35 Update modules
• 73118ae Update docs for assert.deepEqual
• 49c4b55 Release 8.0.1
• a4b72a6 Do not throw TypeError when matching against null and undefined
• 3adfd76 Update assertion.js

There are 67 commits in total. See the full diff.

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