[TASK] Allow numbers in tags

Relates: phpstan#59

Author: sabbelasichon

src/Lexer/Lexer.php

@@ -141,7 +141,7 @@ private function initialize(): void
 
 			self::TOKEN_OPEN_PHPDOC => '/\\*\\*(?=\\s)',
 			self::TOKEN_CLOSE_PHPDOC => '\\*/',
-			self::TOKEN_PHPDOC_TAG => '@[a-z-]++',
+			self::TOKEN_PHPDOC_TAG => '@[a-z][a-z0-9-]*+',
 			self::TOKEN_PHPDOC_EOL => '\\r?+\\n[\\x09\\x20]*+(?:\\*(?!/))?',
 
 			self::TOKEN_FLOAT => '(?:-?[0-9]++\\.[0-9]*+(?:e-?[0-9]++)?)|(?:-?[0-9]*+\\.[0-9]++(?:e-?[0-9]++)?)|(?:-?[0-9]++e-?[0-9]++)',