DOC: Add thanks to changelog
DOC: Add thanks to changelog

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