Upgrade assetgraph to version 4.12.1

[depfu]

We've upgraded a dependency and all tests pass. \o/

name	version specification	new version
assetgraph	4.12.0	4.12.1

You should probably take a good look at this before merging this pull request, of course.

What changed?

✳️ assetgraph ( → 4.12.1) · Repo

Commits

See the full diff on Github. The new version differs by 25 commits:

• 4.12.1
• Merge pull request #908 from assetgraph/feature/caseInsensitiveFontFamilyMatching
• Fix webpack test case after update
• Update in-range dev deps
• Collapse two identical ifs
• Merge pull request #909 from assetgraph/depfu/update/npm/cssnano-4.0.3
• Update cssnano to version 4.0.3
• Match font-family property values case insensitively
• Do not throw away the font-style and font-weight bits when patching up the font shorthand
• Merge pull request #907 from assetgraph/depfu/update/npm/specificity-0.4.0
• Merge pull request #906 from assetgraph/depfu/update/npm/uglify-js-3.4.5
• Update specificity to version 0.4.0
• Update uglify-js to version 3.4.5
• Merge pull request #905 from assetgraph/depfu/update/npm/autoprefixer-9.0.0
• Update autoprefixer to version 9.0.0
• Merge pull request #903 from assetgraph/depfu/update/npm/postcss-7.0.0
• Merge pull request #902 from assetgraph/test/issue901
• Be less harsh and only error out when there's more than one @font-face with the same family/style/weight combo
• Update postcss to version 7.0.0
• addPrecacheServiceWorker: Skip more relation types when traversing for assets to include
• Just error out when encountering @font-face { unicode-range: ... }
• Add regression test for #901
• _.values => Object.values
• subsetFonts: Don't include template placeholders when gathering text
• subsetFonts: Ignore ::ms-expand pseudo element (not supported by nwsapi)

---

Depfu will automatically keep this PR conflict-free, as long as you don't add any commits to this branch yourself. You can also trigger a rebase manually by commenting with @depfu rebase.