🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

scripts/readme-gen/readme_gen.py

@@ -33,37 +33,37 @@
     autoescape=True,
 )
 
-README_TMPL = jinja_env.get_template("README.tmpl.rst")
+README_TMPL = jinja_env.get_template('README.tmpl.rst')
 
 
 def get_help(file):
-    return subprocess.check_output(["python", file, "--help"]).decode()
+    return subprocess.check_output(['python', file, '--help']).decode()
 
 
 def main():
     parser = argparse.ArgumentParser()
-    parser.add_argument("source")
-    parser.add_argument("--destination", default="README.rst")
+    parser.add_argument('source')
+    parser.add_argument('--destination', default='README.rst')
 
     args = parser.parse_args()
 
     source = os.path.abspath(args.source)
     root = os.path.dirname(source)
     destination = os.path.join(root, args.destination)
 
-    jinja_env.globals["get_help"] = get_help
+    jinja_env.globals['get_help'] = get_help
 
-    with io.open(source, "r") as f:
+    with io.open(source, 'r') as f:
         config = yaml.load(f)
 
     # This allows get_help to execute in the right directory.
     os.chdir(root)
 
     output = README_TMPL.render(config)
 
-    with io.open(destination, "w") as f:
+    with io.open(destination, 'w') as f:
         f.write(output)
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     main()