Update project webtorrent to 0.19.1

libgrabber updated project webtorrent to 0.19.1.

@feross

### Metadata information

```json
{
  "metadata": {
    "packageManager": "npm",
    "name": "webtorrent",
    "repo": "feross/webtorrent",
    "files": {
      "include": ["webtorrent.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/webtorrent",
    "localVersions": [],
    "remoteVersions": ["0.0.1", "0.1.1", "0.1.2", "0.2.0", "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", "0.2.11", "0.2.12", "0.2.13", "0.2.14", "0.2.15", "0.2.16", "0.2.17", "0.2.18", "0.3.0", "0.3.1", "0.3.2", "0.3.3", "0.4.0", "0.5.0", "0.5.1", "0.5.2", "0.5.3", "0.5.4", "0.6.0", "0.7.0", "0.7.1", "0.7.2", "0.7.3", "0.8.0", "0.8.1", "0.8.2", "0.9.0", "0.10.0", "0.10.1", "0.10.2", "0.10.3", "0.11.0", "0.11.1", "0.11.2", "0.11.3", "0.12.0", "0.12.1", "0.13.0", "0.13.1", "0.14.0", "0.15.0", "0.16.0", "0.17.0", "0.17.1", "0.18.0", "0.19.0", "0.19.1"],
    "branchVersions": []
  },
  "version": "0.19.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/webtorrent/0.19.1",
  "branch": "webtorrent/0.19.1"
}
```