SimpleITK Release v2.4rc3

This is SimpleITK 2.4.0 Release Candidate 3.

To upgrade to the latest pre-release Python binary package run: pip install --upgrade --pre SimpleITK --find-links https://github.com/SimpleITK/SimpleITK/releases/tag/v2.4rc3

What’s Changed

• Update SWIG docs string from SimpleITK Doxygen by @blowekamp in https://github.com/SimpleITK/SimpleITK/pull/2170

Full Changelog: https://github.com/SimpleITK/SimpleITK/compare/latest…v2.4rc3