Removed reference to Python 3.5 which is not supported.

Author: rohe

setup.py

@@ -47,7 +47,6 @@
         "Development Status :: 4 - Beta",
         "License :: OSI Approved :: Apache Software License",
         "Topic :: Software Development :: Libraries :: Python Modules",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",