Drop py3.5 from setup.py

Author: smurfix

setup.py

@@ -88,8 +88,9 @@
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Topic :: System :: Networking",
         "Framework :: Trio",
         "Framework :: AsyncIO",