- Update to 20.3.0 [1]
- Include extra_require options on by default [2]
- Excluding extra_require soap due to soappy being python 2.7 only
[1] https://github.com/twisted/twisted/blob/trunk/NEWS.rst#twisted-2030-2020-03-13
[2] https://github.com/twisted/twisted/blob/trunk/src/twisted/python/_setup.py#L94
soappy is a python 2.7 only project and has a long running issue with Twisted to be replaced with something else (ZSI 2.0). https://twistedmatrix.com/trac/ticket/3283