Update the firmware version from 20 to 2.0

csharp/Lib/Devices/BatteryDeligreen/TelemetryFrameParser.cs

@@ -41,6 +41,12 @@ public class TelemetryFrameParser
         try
         {
             versionAscii = HexToAscii(versionBytes);
+            
+            if (versionAscii.Length >= 2)
+            {
+                // Insert a dot between the first and second character
+                versionAscii = versionAscii[..1] + "." + versionAscii.Substring(1, 1);
+            }
            // Console.WriteLine($"Firmware version: {versionBytes} (Hex), ASCII: {versionAscii}");
         }
         catch (Exception)