Fix #14: Update package metadata in setup.py

Author: int19h

setup.py

@@ -103,16 +103,19 @@ def finalize_options(self):
         license="MIT",
         author="Microsoft Corporation",
         author_email="ptvshelp@microsoft.com",
-        url="https://aka.ms/ptvs",
+        url="https://aka.ms/debugpy",
         python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*",
         classifiers=[
             "Development Status :: 5 - Production/Stable",
             "Programming Language :: Python :: 2.7",
             "Programming Language :: Python :: 3.5",
             "Programming Language :: Python :: 3.6",
             "Programming Language :: Python :: 3.7",
+            "Programming Language :: Python :: 3.8",
             "Topic :: Software Development :: Debuggers",
-            "Operating System :: OS Independent",
+            "Operating System :: Microsoft :: Windows",
+            "Operating System :: MacOS",
+            "Operating System :: POSIX",
             "License :: OSI Approved :: Eclipse Public License 2.0 (EPL-2.0)",
             "License :: OSI Approved :: MIT License",
         ],