`bioformats.__version__` should print package version (reloaded)

[ehrenfeu]

The fix merged in #86 being

https://github.com/imcf/python-bioformats/blob/08161368eebea17578d03e7c8fe52211d4f454ce/setup.py#L42-L45

got silently removed (again) in 2d487239b3a8d531e69342cec89ca2395cd0e56a, resulting in a call to

import bioformats
print(bioformats.__version__)

returning ’0.0.0’ (again).