Update xo to the latest version 🚀

[greenkeeper]

Version 0.21.0 of xo was just published.

Dependency	xo
Current Version	0.18.2
Type	devDependency

The version 0.21.0 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of xo.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Release Notes

v0.21.0

Highlights

• Dropped support for Node.js 4 and 5 as they reached end of life. Node.js 6 is the minimum required version.
• Upgrade to Prettier 1.12.1.
• The default value for trailingComma Prettier option is now none. f67ff58
• Disable unicorn/number-literal-case when using Prettier to avoid conflict. 4fd6991
• Ignore prettier-ignore comments in capitalized-comments rule. xojs/eslint-config-xo@6e417ff
• Fix missed detection of incorrect indentation with indent rule. xojs/eslint-config-xo@145993e
• Allow named function in prefer-arrow-callback. xojs/eslint-config-xo@bda02cb

New rules

• valid-jsdoc
• promise/no-new-statics
• promise/valid-params
• import/no-self-import
• import/no-useless-path-segments

Removed rules

• import/prefer-default-export

Commits

The new version differs by 63 commits.

• b633e92 Do not override default options with absent CLI flags (#316)
• cec0853 Update plugins and add some new rules
• d1eb47c Require Node.js 6
• 6254110 GitHub now natively supports SVG
• 4fd6991 Disable number-literal-case rule when using Prettier (#311)
• 7190640 Remove import/prefer-default-export rule
• f67ff58 Default Prettier trailingComma conf to none (#305)
• 11c35c8 Upgrade prettier to last version (#306)
• f100021 0.20.3
• 5f062e2 Simplify appveyor.yml
• c62345c Make Prettier confing take precedence over XO (#301)
• 3094538 0.20.2
• 5a55cee Do not add indent rule when prettier option is true (#300)
• bf29ed8 0.20.1
• 71036d1 Disable parsing of prettier CLI option (#298)

There are 63 commits in total.

See the full diff

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