Update project parallax to v2.1.3

libgrabber updated project parallax to v2.1.3.

@wagerfield

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "parallax",
    "repo": "wagerfield/parallax",
    "files": {
      "basePath": "deploy/",
      "include": ["*.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/parallax",
    "localVersions": ["1.0.0", "1.1.0", "1.1.1"],
    "remoteVersions": ["v1.0.0", "v1.1.0", "v1.1.1", "v2.0.0", "v2.0.1", "v2.1.0", "v2.1.1", "v2.1.2", "v2.1.3"],
    "branchVersions": []
  },
  "version": "v2.1.3",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/parallax/2.1.3",
  "branch": "parallax/v2.1.3"
}
```