[doc] Add changelog link to PyPI

pyproject.toml

@@ -10,6 +10,7 @@ license = "GPL-3.0-or-later"
 homepage =  ""
 repository = "https://git.duniter.org/clients/python/duniterpy"
 documentation = "https://clients.duniter.io/python/duniterpy/index.html"
+urls = { Changelog = "https://git.duniter.org/clients/python/duniterpy/-/blob/main/CHANGELOG.md" }
 keywords = ["g1", "duniter", "cryptocurrency", "librecurrency", "library"]
 include = ["examples/*.py"]
 classifiers = [