Annotate types of attrs attributes

[sscherfke]

Is your feature request related to a problem? Please describe. autodoc-typehint adds type hints to attributes of normal classes but not to attributes of attrs classes.

Describe the solution you'd like Type hints are shown for attrs classes, too.

Describe alternatives you've considered Manually hacking around the issue.

Additional context Output for normal classes: Output for attrs classes:

[gaborbernat]

A PR for this would be welcome.