cli: add doc --releases to open release notes

[cuviper]

No description provided.

[rami3l]

@cuviper LGTM! I think I can entrust you with testing out the patch locally?

[cuviper]

I think I can entrust you with testing out the patch locally?

I did try it locally, yes. :)

I'd be happy to add a test as a followup if there's a recommended way of doing that.

[rami3l]

@cuviper The actual effects of such changes are subject to the opener crate I believe, so there unfortunately aren't very good ways to test that with code. OTOH it should be okay as long as the relative path is exact.