Cleaned up some of the dependencies, added conditional mailcap-fix dep

setup.py

@@ -1,13 +1,52 @@
+import sys
+import codecs
 import setuptools
 
 from version import __version__ as version
 
 
+install_requires = [
+    'beautifulsoup4',
+    'decorator',
+    'kitchen',
+    'requests >=2.4.0',  # https://github.com/michael-lazar/rtv/issues/325
+    'six',
+]
+
+tests_require = [
+    'coveralls',
+    'pytest',
+    'coverage',
+    'mock',
+    'pylint',
+    'vcrpy',
+]
+
+extras_require = {}
+
+
+# https://hynek.me/articles/conditional-python-dependencies/
+if int(setuptools.__version__.split(".", 1)[0]) < 18:
+    assert "bdist_wheel" not in sys.argv
+    if sys.version_info[0:2] < (3, 6):
+        install_requires.append("mailcap-fix")
+else:
+    # Building the bdist_wheel with conditional environment dependencies
+    # requires setuptools version > 18. For older setuptools versions this
+    # will raise an error.
+    extras_require.update({":python_version<'3.6'": ["mailcap-fix"]})
+
+
+def long_description():
+    with codecs.open('README.rst', encoding='utf8') as f:
+        return f.read()
+
+
 setuptools.setup(
     name='rtv',
     version=version,
     description='A simple terminal viewer for Reddit (Reddit Terminal Viewer)',
-    long_description=open('README.rst').read(),
+    long_description=long_description(),
     url='https://github.com/michael-lazar/rtv',
     author='Michael Lazar',
     author_email='lazar.michael22@gmail.com',
@@ -16,22 +55,16 @@ setuptools.setup(
     packages=[
         'rtv',
         'rtv.packages',
-        'rtv.packages.praw',
-        ],
+        'rtv.packages.praw'
+    ],
     package_data={
         'rtv': ['templates/*'],
-        'rtv.packages.praw': ['praw.ini'],
-        },
+        'rtv.packages.praw': ['praw.ini']
+    },
     data_files=[("share/man/man1", ["rtv.1"])],
-    install_requires=[
-        'beautifulsoup4',
-        'decorator',
-        'kitchen',
-        'mailcap-fix',
-        # For info on why this is pinned, see https://github.com/michael-lazar/rtv/issues/325
-        'requests >=2.4.0',
-        'six',
-        ],
+    install_requires=install_requires,
+    tests_require=tests_require,
+    extras_require=extras_require,
     entry_points={'console_scripts': ['rtv=rtv.__main__:main']},
     classifiers=[
         'Intended Audience :: End Users/Desktop',