missing comma in setup

Author: Dorian Birraux

setup.py

@@ -22,7 +22,7 @@
 CLASSIFIERS = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3"
+    "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",