Add comma between issue ids if multiple present in the footer

In the commit footer I list a related issue ids, separated by commas. But it's missing from the generated changelog. It would be nice to preserve the comma for better readability reasons.

Example commit:

feat: prefill data

Closes: #XXX-10131, #YYY-59, #YYY-60

The generated changelog: prefill data (f2df98b), closes #XXX-10131 #YYY-59 #YYY-60

I would like this based on the original commit message footer: prefill data (f2df98b), closes #XXX-10131, #YYY-59, #YYY-60