fixed bug in parser where bold text on single line was parsed as list

src/Parser.php

@@ -511,6 +511,10 @@ class Parser {
 		while ($this->current()->type !== TokenType::EOF) {
 			switch($this->current()->type) {
 				case TokenType::ASTERISK:
+					if ($this->next()->type === TokenType::ASTERISK) {
+						$this->buildParagraph($this->parseText(true));
+						break;
+					}
 					$list = $this->parseList();
 					$this->document->appendChild($list);
 					break;