update_folder raise TypeError

[mbovo]

Describe the bug
Method update_folder of folder class raises TypeError('not all arguments converted during string formatting')

To Reproduce
Steps to reproduce the behavior:

1. Create an instance: g = GrafanaFace(...)
2. Run call g.folder.update_folder(uid, title)
3. See TypeError('not all arguments converted during string formatting')

Expected behavior
Method update_folder working as expected

Versions

• Grafana: any
• grafana_api: >= 0.7.3
• Authentication: Basic