add trove classifiers for supported python versions (via #387)

Author: sseliverstov

allure-behave/setup.py

@@ -10,7 +10,12 @@
     'License :: OSI Approved :: Apache Software License',
     'Topic :: Software Development :: Quality Assurance',
     'Topic :: Software Development :: Testing',
-    'Topic :: Software Development :: Testing :: BDD'
+    'Topic :: Software Development :: Testing :: BDD',
+    'Programming Language :: Python :: 2',
+    'Programming Language :: Python :: 2.7',
+    'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
 ]
 
 install_requires = [