view tests/bundles/hgweb+obs.hg @ 39352:035517d48865

contrib: import the relnotes script from the release-tools repo

I figure this makes more sense to keep in the main repo, as it's a
guide of sorts on how to use the releasenotes extension in the
presence of commits that don't get relnotes annotations.

Ported to Python 3, cleaned up some logic in a few places, but for the
most part it's what we've been using for years.

Differential Revision: https://phab.mercurial-scm.org/D4291

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