Require changelog for non-trivial PRs

[ivorbosloper]

Test if this works

[ivorbosloper]

Follow up of #133 (comment)

@m-mohr I just had to try it . It works. Not sure how well we like the changelog-requirement for 20-lines diff in the future

[m-mohr]

I mean it's not really a requirement, and for cases where it shouldn't apply I can bypass it :-)

[m-mohr]

I'd even say, if you could restrict it to only check the fiboa_cli folder (i.e. ignore, tests, docs, CI, etc) we could even "require" it for 1+ changed lines or so.

[ivorbosloper]

I'd even say, if you could restrict it to only check the fiboa_cli folder (i.e. ignore, tests, docs, CI, etc) we could even "require" it for 1+ changed lines or so.

I've changed the check for the fiboa_cli dir. The 20 is already a bit inflated as the diff-format adds like 5 lines for every changed file. We could test how well we like this action, if it's annoying we can disable it again.