Update markdown-it to version 6.0.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

markdown-it just published its new version 6.0.1, 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 markdown-it – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

---

The new version differs by 54 commits .

• 8fcb93c 6.0.1 released
• 7150358 Browser files rebuild
• e679e46 eslint-plugin-nodeca not needed anymore
• 760050e eslint update & code cleanup
• d2e5090 Travis: add more node versions to test
• b5a6ef7 Deps bump
• a10193c Merge pull request #224 from slang800/tables-with-empty-cells
• 86eea8c fix misspelling of "parser"
• 10d6448 support tables with missing values
• 0e51825 Updated docs builder
• 38bf443 6.0.0 released
• b624229 browser files rebuild
• 8c11d9f Suppressed lint warning
• 1845175 Allow node.js to exit naturally
• 53aec24 Improve performance inskipTokenwhen maxNesting is exceeded

There are 54 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 :zap:}