Update project underscore.js to 1.7.0

libgrabber updated project underscore.js to 1.7.0.

@jashkenas

### Metadata information

```json
{
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    "packageManager": "github",
    "name": "underscore.js",
    "repo": "jashkenas/underscore",
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      "exclude": []
    },
    "path": "/home/jsdelivr/files/underscorejs",
    "localVersions": ["1.4.2", "1.4.3", "1.4.4", "1.5.1", "1.5.2", "1.6.0"],
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    "branchVersions": []
  },
  "version": "1.7.0",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/underscorejs/1.7.0",
  "branch": "underscore.js/1.7.0"
}
```