Pin tifffile to 0.12.*
Pin tifffile to 0.12.*

Currently `nanshe` breaks with tifffile 0.13.0+. So pin the `tifffile`
requirement to 0.12.*.

jakirkham/nanshe,DudLab/nanshe,nanshe-org/nanshe,nanshe-org/nanshe,DudLab/nanshe,jakirkham/nanshe