message: fix redundant imports (maybe due to rebasing)
diff: @@ -5,11 +5,7 @@ use crate::leadership::genesis::ActiveSlotsCoeff;
  use crate::milli::Milli;
  use crate::update::Error;
  use crate::{block::ConsensusVersion, config::ConfigParam, fee::LinearFee, leadership::bft};
  -use chain_core::mempack::{read_vec, ReadBuf, ReadError, Readable};
  -use chain_core::property;
  -use chain_crypto::{Ed25519Extended, PublicKey, SecretKey, Verification};
  use chain_time::era::TimeEra;
  -use std::collections::{BTreeMap, HashSet};
  use std::convert::TryFrom;
  use std::sync::Arc;
  