update doc build requirements in info.py
update doc build requirements in info.py

poldracklab/preprocessing-workflow,poldracklab/preprocessing-workflow,oesteban/preprocessing-workflow,oesteban/fmriprep,oesteban/preprocessing-workflow,oesteban/fmriprep,poldracklab/fmriprep,poldracklab/fmriprep,oesteban/fmriprep,poldracklab/fmriprep