update code

mrdna/readers/.DS_Store

mrdna/readers/__init__.py

mrdna/readers/segmentmodel_from_cadnano.py

mrdna/readers/test.csv

mrdna/readers/test/1.json

mrdna/readers/test/ipykernel_launcher.json

mrdna/readers/test/loopout.sc

mrdna/readers/test/s.csv

mrdna/readers/test/segmentmodel_from_cadnano_old.py

mrdna/readers/test/seq0.txt

mrdna/readers/test/test.ipynb

mrdna/readers/test/test.sc

mrdna/readers/test/test2.ipynb

mrdna/readers/test/test3.ipynb

mrdna/readers/test/test_cad2.5.json

mrdna/readers/test/test_insert.sc

mrdna/readers/test/test_insert_2.5.json

mrdna/readers/test/test_insert_seq2.json

mrdna/readers/test/test_insert_seq3.json