remove deprecated license classifier in setup.py

Author: boegel

setup.py

@@ -71,7 +71,6 @@ def read(fname):
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Intended Audience :: System Administrators",
-        "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",