CHG: Lib is only supported on python3.7 and newer

setup.py

@@ -19,6 +19,7 @@ setup(
     description='This is a meta package to install the automatically generated NET-API 3.0 definitions.',
     url='https://git.scc.kit.edu/scc-net/net-suite/netdb-client-lib',
     install_requires=['argparse', 'requests'],
+    python_requires='>=3.7'
     packages=['netdb_client'],
     cmdclass={'build_py': APIGenBuild}
 )