Add BlockSizeTooSmallException (#471)

Author: Qraxin

src/Exception/BlockSizeTooSmallException.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Endroid\QrCode\Exception;
+
+final class BlockSizeTooSmallException extends \Exception
+{
+}

src/Matrix/Matrix.php

@@ -4,6 +4,7 @@
 
 namespace Endroid\QrCode\Matrix;
 
+use Endroid\QrCode\Exception\BlockSizeTooSmallException;
 use Endroid\QrCode\RoundBlockSizeMode;
 
 final readonly class Matrix implements MatrixInterface
@@ -43,7 +44,7 @@ public function __construct(
         }
 
         if ($blockSize < 1) {
-            throw new \Exception('Too much data: increase image dimensions or lower error correction level');
+            throw new BlockSizeTooSmallException('Too much data: increase image dimensions or lower error correction level');
         }
 
         $this->blockSize = $blockSize;