BUG: Sort release tags with creatordate instead of taggerdate

Required per the discussion here:

  https://stackoverflow.com/questions/6269927/how-can-i-list-all-tags-in-my-git-repository-by-the-date-they-were-created

Author: thewtex

utilities/release-notes.py

@@ -9,7 +9,7 @@
 output_file = sys.argv[1]
 
 with open(output_file, 'w') as fp:
-    tags = subprocess.check_output(['git', 'tag', '--sort=taggerdate']).decode('utf-8')
+    tags = subprocess.check_output(['git', 'tag', '--sort=creatordate']).decode('utf-8')
     recent_tags = tags.split()[-2:]
     previous_tag = recent_tags[0]
     current_tag = recent_tags[1]