Bump setuptools from 49.2.0 to 50.3.0 (#71)

Bumps [setuptools](https://github.com/pypa/setuptools) from 49.2.0 to 50.3.0.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/master/CHANGES.rst)
- [Commits](https://github.com/pypa/setuptools/compare/v49.2.0...v50.3.0

)

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requirements.build.txt

-setuptools==49.2.0
+setuptools==50.3.0
 wheel==0.34.2