Added version property to be visible as a part of decoding (#25)

Author: Shivamaggw

lib/src/common/decoder_result.dart

@@ -31,13 +31,17 @@ class DecoderResult {
   final int structuredAppendParity;
   final int structuredAppendSequenceNumber;
 
+  /// The QR code version as an integer, if available
+  final int? version;
+
   DecoderResult({
     this.rawBytes,
     required this.text,
     required this.byteSegments,
     required this.ecLevel,
     this.structuredAppendParity = -1,
     this.structuredAppendSequenceNumber = -1,
+    this.version,
   }) : numBits = rawBytes == null ? 0 : 8 * rawBytes.length;
 
   bool get hasStructuredAppend {

lib/src/qrcode/decoder/decoded_bit_stream_parser.dart

@@ -122,7 +122,8 @@ class DecodedBitStreamParser {
         byteSegments: byteSegments.isEmpty ? null : byteSegments,
         ecLevel: ecLevel?.toString(),
         structuredAppendParity: symbolSequence,
-        structuredAppendSequenceNumber: parityData);
+        structuredAppendSequenceNumber: parityData,
+        version: version.versionNumber);
   }
 
   /// See specification GBT 18284-2000

lib/src/qrcode/qrcode_reader.dart

@@ -50,7 +50,8 @@ class QRCodeReader implements Reader {
 
     var result = Result(
         decoderResult.text, decoderResult.rawBytes, BarcodeFormat.qrCode,
-        points: points);
+        points: points,
+        version: decoderResult.version);
     var byteSegments = decoderResult.byteSegments;
     if (byteSegments != null) {
       result.putMetadata(ResultMetadataType.byteSegments, byteSegments);

lib/src/result.dart

@@ -31,8 +31,11 @@ class Result {
 
   final DateTime time;
 
+  /// The QR code version as an integer, if available
+  final int? version;
+
   Result(this.text, this.rawBytes, this.format,
-      {List<ResultPoint>? points, int? numBits, DateTime? time})
+      {List<ResultPoint>? points, int? numBits, DateTime? time, this.version})
       : numBits = numBits ?? (rawBytes == null ? 0 : 8 * rawBytes.length),
         time = time ?? DateTime.now() {
     if (points != null) {

lib/src/result_metadata_type.dart

@@ -50,4 +50,7 @@ enum ResultMetadataType {
   /// If the code format supports structured append and the current scanned code is part of one then the
   /// parity is given with it.
   structuredAppendParity,
+
+  /// QR code version number (int)
+  version,
 }