Add ignore for OpenWormData submodule files.
Add ignore for OpenWormData submodule files.


Former-commit-id: 4480808e8d9a6848fca992c534d78503b981688a
gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm,gsarma/PyOpenWorm,openworm/PyOpenWorm,hnunner/PyOpenWorm,openworm/PyOpenWorm,travs/PyOpenWorm