message: Update signal slot config to match updated signal signature.
diff: @@ -74,7 +74,7 @@ namespace eosio { namespace chain {
  bool read_only = false;
  std::vector<signal<void(const block_trace&)>::slot_type> applied_block_callbacks;
  std::vector<signal<void(const signed_block&)>::slot_type> applied_irreversible_block_callbacks;
  - std::vector<signal<void(const packed_transaction&)>::slot_type> on_pending_transaction_callbacks;
  + std::vector<signal<void(const transaction_metadata&, const packed_transaction&)>::slot_type> on_pending_transaction_callbacks;
  contracts::genesis_state_type genesis;
  runtime_limits limits;
  };
  