Update setup.py to match PyPA sampleproject

setup.py

@@ -1,6 +1,11 @@
 #!/usr/bin/env python
+from codecs import open
+import os.path
+
 from setuptools import find_packages, setup
 
+here = os.path.abspath(os.path.dirname(__file__))
+
 
 def get_version():
     with open('stix2/version.py') as f:
@@ -11,18 +16,39 @@ def get_version():
         raise AttributeError("Package does not have a __version__")
 
 
-install_requires = [
+with open(os.path.join(here, 'README.md'), encoding='utf-8') as f:
+    long_description = f.read()
+
+setup(
+    name='stix2',
+    version=get_version(),
+    description='Produce and consume STIX 2 JSON content',
+    long_description=long_description,
+    url='https://github.com/oasis-open/cti-python-stix2',
+    author='OASIS Cyber Threat Intelligence Technical Committee',
+    author_email='cti-users@lists.oasis-open.org',
+    maintainer='Greg Back',
+    maintainer_email='gback@mitre.org',
+    license='BSD',
+    classifiers=[
+        'Development Status :: 4 - Beta',
+        'Intended Audience :: Developers',
+        'Topic :: Security',
+        'License :: OSI Approved :: BSD License',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+    ],
+    keywords="stix stix2 json cti cyber threat intelligence",
+    packages=find_packages(),
+    install_requires=[
         'pytz',
         'six',
         'python-dateutil',
         'requests',
-]
+    ],
-
-setup(
-    name='stix2',
-    description="Produce and consume STIX 2 JSON content",
-    version=get_version(),
-    packages=find_packages(),
-    install_requires=install_requires,
-    keywords="stix stix2 json cti cyber threat intelligence",
 )