Update project better-dom to v2.1.0-beta.1

libgrabber updated project better-dom to v2.1.0-beta.1.

@chemerisuk

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "better-dom",
    "repo": "chemerisuk/better-dom",
    "files": {
      "basePath": "dist/",
      "include": ["better-dom.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/better-dom",
    "localVersions": ["1.7.5", "1.7.6", "1.7.7", "2.0.0-alpha.1", "2.0.0-beta.1", "2.0.0-beta.2", "2.0.0-beta.3", "2.0.0-rc.1", "2.0.0-rc.2", "2.0.0", "2.0.1", "2.0.2", "2.0.3"],
    "remoteVersions": ["v1.5.0", "v1.5.5", "v1.6.0", "v1.6.6", "v1.7.0", "v1.7.1", "v1.7.2", "v1.7.3", "v1.7.4", "v1.7.5", "v1.7.6", "v1.7.7", "v2.0.1", "v2.0.2", "v2.0.3", "v2.1.0-beta.1"],
    "branchVersions": []
  },
  "version": "v2.1.0-beta.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/better-dom/2.1.0-beta.1",
  "branch": "better-dom/v2.1.0-beta.1"
}
```