Update project morris.js to 0.5.1

libgrabber updated project morris.js to 0.5.1.

@morrisjs

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "morris.js",
    "repo": "morrisjs/morris.js",
    "files": {
      "include": ["morris.css", "morris.js", "morris.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/morris.js",
    "localVersions": ["0.4.1", "0.4.3", "0.5.0"],
    "remoteVersions": ["0.2.1", "0.2.2", "0.2.3", "0.2.4", "0.2.5", "0.2.6", "0.2.7", "0.2.8", "0.2.9", "0.2.10", "0.3.0", "0.3.1", "0.3.2", "0.3.3", "0.4.0", "0.4.1", "0.4.2", "0.4.3", "0.5.0", "0.5.1"],
    "branchVersions": []
  },
  "version": "0.5.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/morris.js/0.5.1",
  "branch": "morris.js/0.5.1"
}
```