Improve Release Process

[jmchilton]

• [x] Document it. It is the same procedure as planemo but it isn't documented - https://github.com/galaxyproject/planemo/blob/master/docs/developing.rst.
• [x] Add others' to PyPI roles.

[rhpvorderman]

https://ephemeris.readthedocs.io/en/latest/developing.html documents it, and @bgruening also has PyPI permissions.

[jmchilton]

Thanks for closing this out!