Limit php maximum version to php 8.1 (#335)

* Limit php maximum version

* Updated tools

Author: norberttech

README.md

@@ -14,7 +14,7 @@ PHPMatcher::error() : ?string;
 
 It was built to simplify API's functional testing.
 
-* [![Build Status](https://github.com/coduo/php-matcher/workflows/Tests/badge.svg?branch=6.x)](https://github.com/coduo/php-matcher/actions?query=workflow%3ATests) - [6.x README](https://github.com/coduo/php-matcher/tree/6.x/README.md)  PHP >= 7.4
+* [![Build Status](https://github.com/coduo/php-matcher/workflows/Tests/badge.svg?branch=6.x)](https://github.com/coduo/php-matcher/actions?query=workflow%3ATests) - [6.x README](https://github.com/coduo/php-matcher/tree/6.x/README.md)  PHP >= 7.4 <= 8.1
 * [![Build Status](https://github.com/coduo/php-matcher/workflows/Tests/badge.svg?branch=5.x)](https://github.com/coduo/php-matcher/actions?query=workflow%3ATests) - [5.x README](https://github.com/coduo/php-matcher/tree/5.x/README.md)  PHP >= 7.2 < 8.0
 * [![Build Status](https://github.com/coduo/php-matcher/workflows/Tests/badge.svg?branch=5.0)](https://github.com/coduo/php-matcher/actions?query=workflow%3ATests) - [5.0 README](https://github.com/coduo/php-matcher/tree/5.0/README.md)  PHP >= 7.2 < 8.0
 * [![Build Status](https://travis-ci.org/coduo/php-matcher.svg?branch=4.0)](https://travis-ci.org/coduo/php-matcher) - [4.0.* README](https://github.com/coduo/php-matcher/tree/4.0/README.md)  PHP >= 7.2 < 8.0

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=7.4",
+        "php": "^7.4.2 || ~8.0 || ~8.1",
         "ext-filter": "*",
         "ext-json": "*",
         "ext-simplexml": "*",

composer.lock

@@ -125,12 +125,17 @@ private function getExpanderName() : string
 
         $expander = $this->lexer->lookahead['value'];
 
+        /** @phpstan-ignore-next-line */
         if ($expander === null) {
             throw PatternException::syntaxError($this->unexpectedSyntaxError($this->lexer->lookahead, '.expanderName(args) definition'));
         }
 
         $this->lexer->moveNext();
 
+        if (\is_int($expander)) {
+            return (string) $expander;
+        }
+
         return $expander;
     }