Bump primer-core from 6.7.0 to 6.8.0

[dependabot-preview]

Bumps primer-core from 6.7.0 to 6.8.0.

Changelog

Sourced from primer-core's changelog.

10.4.0 (2018-03-14)

🚀 Enhancement

• #456 Adding height-fit utility class. ([jonrohan](https://github.com/jonrohan))

📝 Documentation

• #455 Add colorizeTooltip deprecation warning. ([jonrohan](https://github.com/jonrohan))
• #452 Update dead links in CONTRIBUTING.md. ([agisilaos](https://github.com/agisilaos))

Committers: 3

• Agisilaos Tsaraboulidis (agisilaos)
• Jon Rohan (jonrohan)
• muan

10.3.0 (2018-01-17)

🚀 Enhancement

• #426 Add em spacer variables. ([broccolini](https://github.com/broccolini))
• #430 Increase input font-size to 16px on mobile. ([broccolini](https://github.com/broccolini))

🐛 Bug Fix

• #416 Point style field to build file in subhead component. ([muan](https://github.com/muan))
• #424 Add missing $spacer-12 in $marketingSpacers variable. ([gladwearefriends](https://github.com/gladwearefriends))

💅 Polish

• #418 Button color contrast improvements. ([broccolini](https://github.com/broccolini))

📝 Documentation

• #427 Adding stories from markdown for the other modules that didn't have any stories. ([jonrohan](https://github.com/jonrohan))

🏠 Internal

• #420 Update licenses to 2018 🎊. ([jonrohan](https://github.com/jonrohan))

Committers: 4

• Catherine Bui (gladwearefriends)
• Diana Mounter (broccolini)
• Jon Rohan (jonrohan)
• muan

10.2.0 (2017-12-11)

🚀 Enhancement

• #376 Extend spacing scale for marketing. ([gladwearefriends](https://github.com/gladwearefriends))
• #409 Add Sass key to package.json. ([broccolini](https://github.com/broccolini))
• #358 automatically style first and last breadcrumb. ([gronke](https://github.com/gronke))
• #394 Point style field to built css. ([koddsson](https://github.com/koddsson))

📝 Documentation

• #411 Updates to stylelint package links/docs for new structure. ([jonrohan](https://github.com/jonrohan))

... (truncated)

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[MikeMcQuaid]

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