Update setup.py to restrict setuptools_scm versions.

Author: a-feld

setup.py

@@ -132,10 +132,11 @@ def build_extension(self, ext):
             "git_describe_command": "git describe --dirty --tags --long --match *.*.*.*",
             "write_to": "newrelic/version.txt",
         },
-        setup_requires=['setuptools_scm'],
+        setup_requires=["setuptools_scm>=3.2,<4"],
         description = "New Relic Python Agent",
         long_description = open(readme_file).read(),
-        url = "http://newrelic.com/docs/python/new-relic-for-python",
+        url = "https://newrelic.com/docs/python/new-relic-for-python",
+        project_urls = {"Source": "https://github.com/newrelic/newrelic-python-agent"},
         author = "New Relic",
         author_email = "[email protected]",
         maintainer = 'New Relic',