Add command to add CHANGELOG entries
A command like assixt changelog added Introduced some new fancy feature
, which will then add "Introduced some new fancy feature"
as a list item under the ### Added
heading in the CHANGELOG
under the [UNRELEASED]
version marker. If such a version marker does not exist yet, add it. Similar actions should be possible for adding entries under ### Changed
and ### Removed
.
This should make it easier to add new entries to the CHANGELOG
.