Fixing freesurfer download URL
Fixing freesurfer download URL

See https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg59406.html
poldracklab/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,poldracklab/fmriprep,oesteban/fmriprep,poldracklab/preprocessing-workflow,oesteban/preprocessing-workflow