added `strict` mode

src/Parkdown.php

@@ -8,11 +8,11 @@ class Parkdown {
 	private string      $sourceCode;
 	private DOMDocument $tree_;
 
-	public function __construct(string $sourceCode) {
+	public function __construct(string $sourceCode, bool $strict = false, ?string $fileName = null) {
 		$this->sourceCode = $sourceCode;
 
-		$lexer  = new Lexer($this->sourceCode);
-		$parser = new Parser($lexer->tokenize());
+		$lexer  = new Lexer($this->sourceCode, $fileName);
+		$parser = new Parser($lexer->tokenize(), $strict);
 	
 		$this->tree_ = $parser->parse();
 	}