Update project markdown-it to 2.1.3

libgrabber updated project markdown-it to 2.1.3.

@markdown-it

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "markdown-it",
    "repo": "markdown-it/markdown-it",
    "files": {
      "basePath": "dist/",
      "include": ["markdown-it.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/markdown-it",
    "localVersions": ["2.0.0", "2.1.0", "2.1.1", "2.1.2"],
    "remoteVersions": ["2.0.0", "2.1.0", "2.1.1", "2.1.2", "2.1.3"],
    "branchVersions": []
  },
  "version": "2.1.3",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/markdown-it/2.1.3",
  "branch": "markdown-it/2.1.3"
}
```