fix: bring nitime dependency back
fix: bring nitime dependency back

Compute DVARS requires it, but nipype does not mark it as a standard
dependency.

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