add checkpoint

.coverage

+!coverage.py: This is a private format, don't read it directly!{"lines":{"/Users/andrey/Documents/nd2shrink/nd2shrink/__init__.py":[],"/Users/andrey/Documents/nd2shrink/nd2shrink/__main__.py":[],"/Users/andrey/Documents/nd2shrink/nd2shrink/read.py":[],"/Users/andrey/Documents/nd2shrink/nd2shrink/save.py":[],"/Users/andrey/Documents/nd2shrink/nd2shrink/transform.py":[]}}
\ No newline at end of file