message: Unused params in eosio.token
  Removes unused stats table reference passed to add_balance and sub_balance
diff: @@ -78,11 +78,11 @@ void token::transfer( account_name from,
  eosio_assert( quantity.symbol == st.supply.symbol, "symbol precision mismatch" );
  - sub_balance( from, quantity, st );
  - add_balance( to, quantity, st, from );
  + sub_balance( from, quantity );
  + add_balance( to, quantity, from );
  }
  -void token::sub_balance( account_name owner, asset value, const currency_stats& st ) {
  +void token::sub_balance( account_name owner, asset value ) {
  accounts from_acnts( _self, owner );
  const auto& from = from_acnts.get( value.symbol.name() );
  @@ -98,7 +98,7 @@ void token::sub_balance( account_name owner, asset value, const currency_stats&
  }
  }
  -void token::add_balance( account_name owner, asset value, const currency_stats& st, account_name ram_payer )
  +void token::add_balance( account_name owner, asset value, account_name ram_payer )
  {
  accounts to_acnts( _self, owner );
  auto to = to_acnts.find( value.symbol.name() );
  