Release v0.31.1

What's Changed

• Cap video bitrate and report it to the server by @Karolk99 in #609
• FCE-3912 Keep iOS call audio working after audio-session changes and CallKit hold by @Magmusacy in #617
• Release v0.31.1 by @Magmusacy in #619

Full Changelog: v0.31.0...v0.31.1