Set project_urls in setup.py

See https://packaging.python.org/guides/distributing-packages-using-setuptools/#project-urls

Author: peterjc

setup.py

@@ -23,6 +23,11 @@ def get_version(fname="flake8_rst_docstrings.py"):
     author="Peter J. A. Cock",
     author_email="p.j.a.cock@googlemail.com",
     url="https://github.com/peterjc/flake8-rst-docstrings",
+    project_urls={
+        "Documentation": "https://github.com/peterjc/flake8-rst-docstrings/blob/master/README.rst",
+        "Source": "https://github.com/peterjc/flake8-rst-docstrings/",
+        "Tracker": "https://github.com/peterjc/flake8-rst-docstrings/issues",
+    },
     classifiers=[
         "Intended Audience :: Developers",
         "Framework :: Flake8",