chore: cleanup and Python 3.10+ support

Author: rubik

requirements.txt

@@ -1,3 +1,3 @@
 radon>=4,<7
 requests>=2.0,<3.0
-PyYAML>=4.2b1,<7.0
+PyYAML>=5.0,<7.0

test_xenon.py

@@ -9,6 +9,7 @@
 import sys
 import argparse
 
+# Monkey-patch paramunittest for Python 3.10+
 if sys.version_info[:2] >= (3, 10):
     import collections.abc
     collections.Mapping = collections.abc.Mapping