Throw exception when request has wrong quantity

[kalwinskidawid]

Hey, I found a bug. When you try send request eg. with huge quantity then program will throw exception:

Application: ModbusSlave.exe Architecture version: v4.0.30319 Description: the process was 
aborted due to an unhandled exception. Exception information: 
System.OverflowException w 
ModbusLib.Protocols.ModbusCodecReadMultipleRegisters.ServerDecode(ModbusLib.Protocols.ModbusCommand, 
ModbusLib.ByteArrayReader) w 
ModbusLib.Protocols.ModbusTcpCodec.ModbusLib.Protocols.IProtocolCodec.ServerDecode(ModbusLib.CommDataBase) 
w ModbusLib.TcpServer.Worker() w 
System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, 
System.Threading.ContextCallback, System.Object, Boolean) w 
System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, 
System.Threading.ContextCallback, System.Object, Boolean) w 
System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, 
System.Threading.ContextCallback, System.Object) w 
System.Threading.ThreadHelper.ThreadStart()

Example request 000100000006010363c09c85