Bugfix: An array with a length of 1 cannot be accessed at index 1 but…

… only at 0.

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Pcx857x/Driver/Drivers/Extras/Pcx8574.cs

@@ -158,7 +158,7 @@ protected byte ReadState8()
         {
             Span<byte> buffer = stackalloc byte[1];
             i2cComms.Read(buffer);
-            return buffer[1];
+            return buffer[0];
         }
 
         /// <summary>