We always add some extra files, at least the Apertis component,
plus copyright scanning results. Since those are intended to end up
in the source package, we should append a version suffix regardless
of any other actual changes we add on top.

Since these changes are an addition of metadata only, co0 seems a
good enough starting version.

Instead of dch, we use a custom changelog modification implementation.
This is because dch insists on launching an interactive editor when
a changelog is finalised.

Apertis: T7556

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>