Refs. #3954, `CommitteeChanged` event is available from NEO contract since Cockatrice (https://github.com/nspcc-dev/neo-go/pull/3351 and https://github.com/nspcc-dev/neo-go/pull/3892)
Refs. #3954,
CommitteeChangedevent is available from NEO contract since Cockatrice (nspcc-dev/neo-go#3351 and nspcc-dev/neo-go#3892)