Add link to changelog to project_urls

Author: RKrahl

setup.py

@@ -154,6 +154,7 @@ def run(self):
         Source="https://github.com/RKrahl/pytest-dependency",
         Download=("https://github.com/RKrahl/pytest-dependency/releases/%s/"
                   % release),
+        Changes="https://pytest-dependency.readthedocs.io/en/latest/changelog.html",
     ),
     package_dir = {"": "src"},
     python_requires = ">=3.4",