• Breaking change: The regular expression used to validate labels is
  stricter and more correct.
• Add more information about pings to markdown documentation:
  • State wether the ping includes client id;
  • Add list of data review links;
  • Add list of related bugs links.
• glean_parser now makes it easier to write external translation functions for
  different language targets.
• BUGFIX: glean_parser now works on 32-bit Windows.