Update should to version 9.0.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

should just published its new version 9.0.1, 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 5 commits .

• 4e97b97 Release 9.0.1
• 497824f Merge branch 'master' of github.com:shouldjs/should.js
• 6d32faf Fix to get window correctly in iife.
• 95c1dc7 Update History.md
• 558223d Update .travis.yml

See the full diff.

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