Update setup.py

- Add license metadata
- Add `Programming Language :: Python :: 3.7` classifier
- Use HTTPS in the website link

setup.py

@@ -29,12 +29,13 @@ if sys.version_info.major < 3:
 setup(
     name='pelican',
     version='3.7.2.dev0',
-    url='http://getpelican.com/',
+    url='https://getpelican.com/',
     author='Alexis Metaireau',
     maintainer='Justin Mayer',
     author_email='authors@getpelican.com',
     description="Static site generator supporting reStructuredText and "
                 "Markdown source content.",
+    license='AGPLv3',
     long_description=description,
     packages=['pelican', 'pelican.tools'],
     package_data={
@@ -64,6 +65,7 @@ setup(
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Software Development :: Libraries :: Python Modules',