Python 3 compatibility fixes (#5285)

scripts/make_release_notes.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-# Copyright 2019 Google
+# Copyright 2019 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -22,6 +22,7 @@ import re
 import subprocess
 import string
 
+import six
 
 NO_HEADING = 'PRODUCT HAS NO HEADING'
 
@@ -78,7 +79,8 @@ def main():
 
 
 def find_local_repo():
-  url = subprocess.check_output(['git', 'config', '--get', 'remote.origin.url'])
+  url = six.ensure_text(
+      subprocess.check_output(['git', 'config', '--get', 'remote.origin.url']))
 
   # ssh or https style URL
   m = re.match(r'^(?:git@github\.com:|https://github\.com/)(.*)\.git$', url)