Upgrade standard to 16

[abetomo]

• fix tests
• run standard --fix

[zeke]

Wow I'm way late to the party. Thanks for opening this @abetomo and thanks for the approval @jimmywarting which floated this to the top of my notifications.

[zeke]

~/git/zeke/standard-markdown master 9s
$ np major --no-2fa

Publish a new version of standard-markdown (current: 6.0.0)

Commits:
- Merge pull request #40 from abetomo/feature/upgrade_standard_to_16  c7fe72f
- Update .travis.yml  e489d64
- Upgrade standard to 16  2ad8d4e

Commit Range:
v6.0.0...master

Registry:
https://registry.npmjs.org/


  ✔ Prerequisite check
  ✔ Git
  ✔ Cleanup
  ✔ Installing dependencies using npm
  ✔ Running tests using npm
  ✔ Bumping version using npm
  ✔ Publishing package using npm
  ✔ Pushing tags
  ✔ Creating release draft on GitHub

 standard-markdown 7.0.0 published 🎉

[abetomo]

Thanks!