import whole_kidney in segmentation __init__.py

[JSousa-UoL]

Proposed changes

While using ukat 0.5.0, I noticed that I wasn't able to import whole_kidney.py as a package just like the ones in the "mapping" folder. This PR adds that import to the empty __init__.py in the "segmentation" folder.

[codecov[bot]]

Codecov Report

Merging #184 (0fd754b) into dev (eacacf7) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #184   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          34       35    +1     
  Lines        3175     3176    +1     
=======================================
+ Hits         3144     3145    +1     
  Misses         31       31           

Impacted Files	Coverage Δ
ukat/segmentation/__init__.py	100.00% <100.00%> (ø)

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