Remove Python 2 support in setup.py

This commit edits setup.py to require Python 3.5 or greater, and removes
the trove classifiers for Pythons 2, 2.7, 3.3, and 3.4, while adding
the classifier for Python 3 only.

Author: diazona

setup.py

@@ -41,7 +41,7 @@ def run(self):
     url='https://github.com/pytest-dev/pytest-localserver',
 
     packages=['pytest_localserver'],
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*',
+    python_requires='>=3.5',
     install_requires=[
         'werkzeug>=0.10'
     ],
@@ -64,11 +64,8 @@ def run(self):
         'Development Status :: 4 - Beta',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT 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 :: Only',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',