Documentation does not build - uap v1.0

[cmeesters]

Dear Developers,

Frankly, I will not put uap to any use, but tried build the docs. Here, is what I get:

`$ make html
sphinx-build -b html -d build/doctrees source build/html
Running Sphinx v1.8.4

Configuration error:
There is a syntax error in your configuration file: invalid syntax (abstract_step.py, line 876)
Did you change the syntax from 2.x to 3.x?
make: *** [Makefile:55: html] Fehler 2
`

Kind regards,
Christian Meesters