Dependency with graphviz library

[jmhorcas]

The BDD plugin has a dependency not specified in the requirements.
The library graphviz is required in order to write the BDD to an image (png, svg).

This dependency needs to be installed as follows:

• python package: pip install graphviz
• Graphviz software: sudo apt install graphviz

Some tips?

[Virako]

this dependency should add in setup.py, inside install_requires array how 'graphviz~=0.20'

[jmhorcas]

OK. I've added such dependency. However, without the software Graphviz installed it would still fail.

[Virako]

That's true, I believe that adding it in the installation guide is the only thing we can do.