Description of the problem, including code/CLI snippet

services = gl.project_services.available()

is throwing an AttributeError

AttributeError: 'Gitlab' object has no attribute 'project_services'

From the documentation: http://python-gitlab.readthedocs.io/en/latest/gl_objects/projects.html#exammples

Expected Behavior

All strings of available GitLab services are listed. Admin token is used.

Actual Behavior

AttributeError is thrown. Looks like this feature is not implemented, yet?

Specifications

• python-gitlab version: 1.3.0
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): Own GitLab server running 10.6.3