feat: allow pip install roundup[jinja2,extras,test,charting]

Add some optional dependencies to setup.py for roundup. I am using
them for testing and they may be generally useful. For right
not I am not documenting them. They are for internal use.

Also fix formatting of a kwarg.

Author: rouilj

setup.py

@@ -212,6 +212,7 @@ def main():
           license="OSI Approved: MIT License, Zope Public License, Python Software Foundation License",
           long_description=long_description,
           long_description_content_type='text/x-rst',
+          python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
           url='https://www.roundup-tracker.org',
           download_url='https://pypi.org/project/roundup',
           classifiers=['Development Status :: 5 - Production/Stable',
@@ -242,14 +243,20 @@ def main():
                        'Programming Language :: Python :: 3.10',
                        'Programming Language :: Python :: 3.11',
                        'Programming Language :: Python :: 3.12',
+                       'Programming Language :: Python :: Implementation :: CPython',
                        'Topic :: Communications :: Email',
                        'Topic :: Office/Business',
                        'Topic :: Software Development :: Bug Tracking',
                        'Topic :: Internet :: WWW/HTTP :: WSGI :: Application',
                        ],
-
+          extras_require={
+              "charting": ['pygal'],
+              "jinja2": ['jinja2'],
+              "extras": [ 'brotli', 'pytz'],
+              "test": ['pytest > 7.0.0'],
+              },
           # Override certain command classes with our own ones
-          cmdclass= {'build_doc': build_doc,
+          cmdclass={'build_doc': build_doc,
                      'build': build,
                      'bdist_rpm': bdist_rpm,
                      'install_lib': install_lib,