Update LICENSE.txt
Update LICENSE.txt

Former-commit-id: 5f5989e591b61f34ddc0fa04d13b56ee7885c5f0
gsarma/PyOpenWorm,gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm,openworm/PyOpenWorm,travs/PyOpenWorm,hnunner/PyOpenWorm,openworm/PyOpenWorm