Update MANIFEST.in
Update MANIFEST.in

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Former-commit-id: de1f6de3730c7f4bfbcc18f5a290b19d561fd1c6
gsarma/PyOpenWorm,openworm/PyOpenWorm,gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm,openworm/PyOpenWorm,hnunner/PyOpenWorm,travs/PyOpenWorm