temporary workaround for python3 urllib import issues in _fetch_file
temporary workaround for python3 urllib import issues in _fetch_file

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