Update project require-css to 0.1.6

libgrabber updated project require-css to 0.1.6.

@guybedford

### Metadata information

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    "repo": "guybedford/require-css",
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    "branchVersions": []
  },
  "version": "0.1.6",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/require-css/0.1.6",
  "branch": "require-css/0.1.6"
}
```