remove 3.5 and 3.6 from classifiers

Author: madhur-ob

stubs/setup.py

@@ -19,8 +19,6 @@
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",