v3.21.0

✨ New Features

• ca39326 - Validate docName and seriesInfo value for I-D (PR #1116 by @kesara)
  • ↘️ addresses issue #1115 opened by @kesara

🐛 Bug Fixes

• 312b01a - Avoid breaking citation labels (PR #1114 by @kesara)
  • ↘️ fixes issue #685 opened by @ietf-svn-bot

📝 Documentation Changes

• c8e2998 - update CHANGELOG.md + py file versions for v3.20.1 [skip ci] (commit by @kesara)