Modernize to agree with cisagov/skeleton-python-library

Resolves #107.

setup.py

@@ -8,6 +8,10 @@
 - https://blog.ionelmc.ro/2014/05/25/python-packaging/#the-structure
 """
 
+# Standard Python Libraries
+import codecs
+from os.path import abspath, dirname, join
+
 # Third-Party Libraries
 from setuptools import setup
 
@@ -18,12 +22,22 @@ def readme():
         return f.read()
 
 
-def package_vars(version_file):
-    """Read in and return the variables defined by the version_file."""
-    pkg_vars = {}
-    with open(version_file) as f:
-        exec(f.read(), pkg_vars)  # nosec
-    return pkg_vars
+# Below two methods were pulled from:
+# https://packaging.python.org/guides/single-sourcing-package-version/
+def read(rel_path):
+    """Open a file for reading from a given relative path."""
+    here = abspath(dirname(__file__))
+    with codecs.open(join(here, rel_path), "r") as fp:
+        return fp.read()
+
+
+def get_version(version_file):
+    """Extract a version number from the given file path."""
+    for line in read(version_file).splitlines():
+        if line.startswith("__version__"):
+            delim = '"' if '"' in line else "'"
+            return line.split(delim)[1]
+    raise RuntimeError("Unable to find version string.")
 
 
 setup(
@@ -33,13 +47,17 @@ def package_vars(version_file):
     description="Documentation for Github projects in the cisagov organization.",
     long_description=readme(),
     long_description_content_type="text/markdown",
-    # NCATS "homepage"
-    url="https://www.us-cert.gov/resources/ncats",
-    # The project's main homepage
-    download_url="https://github.com/cisagov/skeleton-python-library",
+    # Landing page for CISA's cybersecurity mission
+    url="https://www.cisa.gov/cybersecurity",
+    # Additional URLs for this project per
+    # https://packaging.python.org/guides/distributing-packages-using-setuptools/#project-urls
+    project_urls={
+        "Source": "https://github.com/cisagov/development-guide",
+        "Tracker": "https://github.com/cisagov/development-guide/issues",
+    },
     # Author details
     author="Cyber and Infrastructure Security Agency",
-    author_email="ncats@hq.dhs.gov",
+    author_email="github@cisa.dhs.gov",
     license="License :: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication",
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
     classifiers=[
@@ -55,11 +73,15 @@ def package_vars(version_file):
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: Implementation :: CPython",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     # What does your project relate to?
     keywords="documentation",
     package_dir={"": "project_setup/scripts"},