Bump postcss from 6.0.15 to 6.0.22

[dependabot-preview]

Bumps postcss from 6.0.15 to 6.0.22.

Release notes

Sourced from postcss's releases.

6.0.22

• Fix Node#prev and Node#next on missed parent.

6.0.21

• Rename Chinese docs to fix yarnpkg.com issue.

6.0.20

• Better error message on null as input CSS.

6.0.19

• Fix TypeScript definitions for source maps (by hzlmn).
• Fix source field in TypeScript definitions (by sylvainpolletvillard).

6.0.18

• Use primitive object in TypeScript definitions (by sylvainpolletvillard).

6.0.17

• Fix parsing comment in selector between word tokens (by hzlmn).

6.0.16

• Fix warning text (by mhkeller).

Changelog

Sourced from postcss's changelog.

6.0.22

• Fix Node#prev and Node#next on missed parent.

6.0.21

• Rename Chinese docs to fix yarnpkg.com issue.

6.0.20

• Better error message on null as input CSS.

6.0.19

• Fix TypeScript definitions for source maps (by Oleh Kuchuk).
• Fix source field in TypeScript definitions (by Sylvain Pollet-Villard).

6.0.18

• Use primitive object in TypeScript definitions (by Sylvain Pollet-Villard).

6.0.17

• Fix parsing comment in selector between word tokens (by Oleh Kuchuk).

6.0.16

• Fix warning text (by Michael Keller).

Commits

• 7226903 Release 6.0.22 version
• 9f94322 Fix Node#prev|next on no parent
• c6ac168 Update dependencies
• 1b80470 Added postcss-font-display to plugins list. (#1142)
• fbc6850 Add new syntax (#1141)
• aef3fdb Added postcss-fontsize to plugins list. (#1140)
• aaaf85c Update dependencies
• 06b22de Remove unnecessary link
• e4f11e8 Do not run English spelling check on Chinese docs
• 6f390f6 Add link for postcss-markdown (#1138)
• Additional commits viewable in compare view

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.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot ignore this [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 [this|these] label[s] will set the current labels as the default for future PRs for this repo and language

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• 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.