Loosen PyYAML requirement

Signed-off-by: Emerson Knapp <emerson.b.knapp@gmail.com>

Author: emersonknapp

setup.py

@@ -22,7 +22,7 @@
     install_requires=[
         'markdown2==2.3.7',
         'PyGithub==1.56',
-        'PyYAML==5.3.1',
+        'PyYAML>=5',
         'retrying==1.3.3',
         # This package has not been released to pypi since 2019,
         # but the latest code contains features we need.