Summary

This upgrade enables TAI token to be transferrable on Karura runtime and updates Substrate version.

Release Note: https://github.com/AcalaNetwork/Acala/releases/tag/2.2.2

Referendum

• https://karura.subscan.io/referenda/36
• https://karura.subsquare.io/democracy/referendum/36

https://acala.discourse.group/t/36-runtime-upgrade-enable-tai-token/622