Try to simplify setup.py

Author: Marius

setup.py

@@ -4,39 +4,37 @@
 
 import tusclient
 
-
-install_requires = [
-    'future>=0.16.0', 'requests>=2.18.4', 'six>=1.11.0', 'tinydb>=3.5.0', 'aiohttp>=3.6.2'
-]
-if os.environ.get('READTHEDOCS') != 'True':
-    install_requires.append('certifi>=2018.1.18')
-TESTS_REQUIRE = [
-    'responses>=0.5.1', 'aioresponses>=0.6.2', 'coverage>=4.2', 'pytest>=3.0.3',
-    'pytest-cov>=2.3.1,<2.6'
-]
-
-PY_VERSION = sys.version_info[0], sys.version_info[1]
-if PY_VERSION < (3, 0):
-    long_description = open('README.md').read()
-else:
-    long_description = open('README.md', encoding='utf-8').read()
-
 setup(
     name='tuspy',
     version=tusclient.__version__,
     url='http://github.com/tus/tus-py-client/',
     license='MIT',
     author='Ifedapo Olarewaju',
-    install_requires=install_requires,
-    tests_require=TESTS_REQUIRE,
+    install_requires=[
+        'future>=0.16.0',
+        'requests>=2.18.4',
+        'six>=1.11.0',
+        'tinydb>=3.5.0',
+        'aiohttp>=3.6.2'
+    ],
     extras_require={
-        'test': TESTS_REQUIRE,
-        'dev': ['tox>=2.3.1', 'sphinx-autobuild==0.7.1', 'Sphinx==1.7.1']
+        'test': [
+            'responses>=0.5.1',
+            'aioresponses>=0.6.2',
+            'coverage>=4.2',
+            'pytest>=3.0.3',
+            'pytest-cov>=2.3.1,<2.6'
+        ],
+        'dev': [
+            'tox>=2.3.1',
+            'sphinx-autobuild==0.7.1',
+            'Sphinx==1.7.1'
+        ]
     },
     author_email='ifedapoolarewaju@gmail.com',
     description=
     'A Python client for the tus resumable upload protocol ->  http://tus.io',
-    long_description=(long_description),
+    long_description=open('README.md', encoding='utf-8').read(),
     long_description_content_type='text/markdown',
     packages=['tusclient', 'tusclient.fingerprint', 'tusclient.storage', 'tusclient.uploader'],
     include_package_data=True,