Update trove classifiers

Author: tony

setup.py

@@ -70,10 +70,9 @@ def run_tests(self):
         'Intended Audience :: Developers',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: PyPy',
         "Topic :: Utilities",
         "Topic :: System :: Shells",