DOC: Update copyright assignment to NumFOCUS
DOC: Update copyright assignment to NumFOCUS

The mission of NumFOCUS is to promote open
practices in research, data, and scientific
computing.

https://numfocus.org

thewtex/ITKMinimalPathExtraction,thewtex/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction,thewtex/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction