add python 3.7 to setup.py

Author: dmelikyan

setup.py

@@ -34,6 +34,7 @@ def read(fname):
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Software Development',
         'Topic :: System :: Monitoring',