Update release checklist

(no need to git push twice in succession)

Also: twine uploads now use '--repository' args of colorama and
colorama-test, which need defining in .pypirc. Making project-specific
repo entries like this allows me to use a project-specific token
from pypi, rather than one that grants all privs to every project.

Also: bump version number of 0.4.7dev1
4 files changed