Require Python >= 3.6

Python 3.4 and 3.5 haven't been tested for long time. Enforce
the minimum version so that users may not attempt to use untested
ancient python versions.

Note that Python 3.6 ~ 3.8 already reached their EOL and we may even
remove support for these in the near future.

setup.py

@@ -22,6 +22,7 @@ setup(name=name,
           "Programming Language :: Python :: 3.11",
           "Programming Language :: Python :: 3.12",
         ],
+      python_requires='>=3.6',
       keywords='noVNC websockify',
       license='LGPLv3',
       url="https://github.com/novnc/websockify",

test-requirements.txt

@@ -2,4 +2,3 @@ mock
 nose2
 six
 redis
-wrapt<=1.12.1;python_version<="3.4"