Add missing import

Author: pcisar

src/firebird/driver/__init__.py

@@ -41,7 +41,7 @@
      OperationalError, IntegrityError, InternalError, ProgrammingError,
      NotSupportedError, FirebirdWarning,
      NetProtocol, DirectoryCode, PageSize, DBKeyScope, DbInfoCode, Features, ReplicaMode,
-     StmtInfoCode, TraInfoCode, TraInfoIsolation, TraInfoReadCommitted,
+     StmtInfoCode, ResultSetInfoCode, TraInfoCode, TraInfoIsolation, TraInfoReadCommitted,
      TraInfoAccess, TraIsolation, TraReadCommitted, TraLockResolution, TraAccessMode,
      TableShareMode, TableAccessMode, Isolation, DefaultAction, StatementType, BlobType,
      DbAccessMode, DbSpaceReservation, DbWriteMode, ShutdownMode, OnlineMode,