build(deps-dev): bump xo from 0.20.3 to 0.21.1

[dependabot-preview[bot]]

Bumps xo from 0.20.3 to 0.21.1.

Release notes

*Sourced from [xo's releases](https://github.com/xojs/xo/releases).* > ## v0.21.1 > Fix `space`/`useTabs` conflict message with Prettier. https://github.com/xojs/xo/commit/36f7f38f3c2f495283cda764c68cfee9b4494973 > > ## 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](https://github.com/prettier/prettier/compare/1.10.2...master). > - The default value for `trailingComma` Prettier option is now `none`. https://github.com/xojs/xo/commit/f67ff58c7cafcc7e5ebacbd311532c6886f1063a > - Disable [unicorn/number-literal-case](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/master/docs/rules/number-literal-case.md) when using Prettier to avoid conflict. https://github.com/xojs/xo/commit/4fd6991444e3faeb39a60112e629b77542d80865 > - Ignore `prettier-ignore` comments in [capitalized-comments](https://eslint.org/docs/rules/capitalized-comments) rule. https://github.com/xojs/eslint-config-xo/commit/6e417ff8c04fa7bbcabc6340c125ec524e101ae0 > - Fix missed detection of incorrect indentation with [indent](https://eslint.org/docs/rules/indent) rule. https://github.com/xojs/eslint-config-xo/commit/145993e8e0297b8af3cfd938bbf586b9d541befe > - Allow named function in [prefer-arrow-callback](https://eslint.org/docs/rules/prefer-arrow-callback#allownamedfunctions). https://github.com/xojs/eslint-config-xo/commit/bda02cb977a973033257448b920d637b5c29ada9 > > ## New rules > - [valid-jsdoc](https://eslint.org/docs/rules/valid-jsdoc) > - [promise/no-new-statics](https://github.com/xjamundx/eslint-plugin-promise/blob/master/docs/rules/no-new-statics.md) > - [promise/valid-params](https://github.com/xjamundx/eslint-plugin-promise/blob/master/docs/rules/valid-params.md) > - [import/no-self-import](https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-self-import.md) > - [import/no-useless-path-segments](https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-useless-path-segments.md) > > ## Removed rules > - [import/prefer-default-export](https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/prefer-default-export.md)

Commits

- [`a28625a`](https://github.com/xojs/xo/commit/a28625a2f9d63d51bb46619b0e395c7ecff11e23) 0.21.1 - [`36f7f38`](https://github.com/xojs/xo/commit/36f7f38f3c2f495283cda764c68cfee9b4494973) Fix `space`/`useTabs` conflict message ([#327](https://github-redirect.dependabot.com/xojs/xo/issues/327)) - [`0765998`](https://github.com/xojs/xo/commit/0765998c287de493990e78581e707daf955a12ed) 0.21.0 - [`b633e92`](https://github.com/xojs/xo/commit/b633e9239738ee03e2c711e1ce01b4c28ba4c157) Do not override default options with absent CLI flags ([#316](https://github-redirect.dependabot.com/xojs/xo/issues/316)) - [`cec0853`](https://github.com/xojs/xo/commit/cec0853bdf9fbe3481d133ce7e62f5891865851f) Update plugins and add some new rules - [`d1eb47c`](https://github.com/xojs/xo/commit/d1eb47c8984bd0c53d05c7dce4ed7e03b405aa03) Require Node.js 6 - [`6254110`](https://github.com/xojs/xo/commit/62541104c5fc5583d30edda90d7b2e158e6144c4) GitHub now natively supports SVG - [`4fd6991`](https://github.com/xojs/xo/commit/4fd6991444e3faeb39a60112e629b77542d80865) Disable number-literal-case rule when using Prettier ([#311](https://github-redirect.dependabot.com/xojs/xo/issues/311)) - [`7190640`](https://github.com/xojs/xo/commit/7190640b88e8468f1301bb28be43c7c2e212723b) Remove `import/prefer-default-export` rule - [`f67ff58`](https://github.com/xojs/xo/commit/f67ff58c7cafcc7e5ebacbd311532c6886f1063a) Default Prettier `trailingComma` conf to `none` ([#305](https://github-redirect.dependabot.com/xojs/xo/issues/305)) - Additional commits viewable in [compare view](https://github.com/xojs/xo/compare/v0.20.3...v0.21.1)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Note: This repo was added to Dependabot recently, so you'll receive a maximum of 5 PRs for your first few update runs. Once an update run creates fewer than 5 PRs we'll remove that limit.

You can always request more updates by clicking Bump now in your Dependabot dashboard.

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot ignore this [patch|minor|major] version` will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) - `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language - `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language - `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language - `@dependabot badge me` will comment on this PR with code to add a "Dependabot enabled" badge to your readme Additionally, you can set the following in your Dependabot [dashboard](https://app.dependabot.com): - Update frequency (including time of day and day of week) - Automerge options (never/patch/minor, and dev/runtime dependencies) - Pull request limits (per update run and/or open at any time) - Out-of-range updates (receive only lockfile updates, if desired) - Security updates (receive only security updates, if desired) Finally, you can contact us by mentioning @dependabot.