declare Python 3.7 support in setup.py
diff --git a/setup.py b/setup.py
index 8c47f67ce35..bd666e93c47 100644
--- a/setup.py
+++ b/setup.py
@@ -56,6 +56,7 @@ def has_environment_marker_platform_impl_support():
         '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',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Internet :: WWW/HTTP',

Scrapy supports 3.7 since #3326. 