Update project pouchdb to 3.1.0

libgrabber updated project pouchdb to 3.1.0.

@pouchdb

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "pouchdb",
    "repo": "pouchdb/pouchdb",
    "files": {
      "basePath": "dist/",
      "include": ["pouchdb.min.js", "pouchdb.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/pouchdb",
    "localVersions": ["1.0.0", "1.1.0", "2.0.0", "2.0.1", "2.0.2", "2.1.0", "2.1.1", "2.1.2", "2.2.0", "2.2.1", "2.2.2", "2.2.3", "3.0.0", "3.0.1", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6"],
    "remoteVersions": ["v0.0.10", "v0.0.16", "0.0.17", "0.0.18", "1.0.0", "1.1.0", "2.0.0", "2.0.1", "2.0.2", "2.1.0", "2.1.1", "2.1.2", "2.2.0", "2.2.1", "2.2.2", "2.2.3", "3.0.0", "3.0.1", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6", "3.1.0"],
    "branchVersions": []
  },
  "version": "3.1.0",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/pouchdb/3.1.0",
  "branch": "pouchdb/3.1.0"
}
```