Update jsdom to version 9.2.1 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

jsdom just published its new version 9.2.1, 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 jsdom – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

---

The new version differs by 182 commits .

• 6756aa5 Version 9.2.1
• dcd7bc3 Fix lint errors, some of which would have been bugs
• e91dec8 Make StyleSheetList.prototype.item correctly return null when appropriate
• 37532c7 Clean up internal URL management
• b26ae6c Update to whatwg-url@3.0.0
• 2880d9a Fix documentation of external resources fetched by default
• ab1ec3d Fix setting style.width = "auto" by upgrading cssstyle
• fd22d80 Fix setting style.background = null by upgrading cssstyle
• 460ea2b Port living-html/htmlbuttonelement to web platform tests
• 31e2e8a Port living-html/htmlformelement to web platform tests
• 48450f9 Port living-html/htmltextareaelement to web platform tests
• e41a144 Fix lint errors
• be5ed91 Port living-html/focus tests to web platform tests
• 3b711f2 Fix window error events beyond the first one
• ea6a0e5 Fix baseElement.href getter and other URL things for spec updates

There are 182 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io.
It keeps your software up to date, all the time.

_{Tired of seeing this sponsor message? Upgrade to the supporter plan! You'll also get your pull requests faster ⚡}