remove guzzlehttp/guzzle requirement, add guzzlehttp/psr7 requirement

.github/workflows/tests.yml

@@ -34,7 +34,6 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          extensions: curl
           coverage: none
 
       - name: Install dependencies

README.md

@@ -7,7 +7,10 @@
 ## Requirements
 
 PHP: >= 8.1  
-Extensions: [Composer](https://getcomposer.org/), [PHP-JSON](https://www.php.net/manual/en/book.json.php)
+Extensions: 
+- [Composer](https://getcomposer.org/)
+- [PHP-JSON](https://www.php.net/manual/en/book.json.php)
+- [PSR-18 HTTP-Client](https://packagist.org/providers/psr/http-client-implementation)
 
 ## Install
 
@@ -16,12 +19,16 @@ composer:
 
 ## Usage
 
-Search for the official API Documentation [here](https://developers.lexoffice.io/docs/).  
+Search for the [official API Documentation](https://developers.lexoffice.io/docs/).  
 You need an [API Key](https://app.lexoffice.de/addons/public-api) for that.
 
 ### Basic
 ```php
-$apiKey = getenv('LEX_OFFICE_API_KEY'); // store keys in .env file
+// store keys in .env file
+$apiKey = getenv('LEX_OFFICE_API_KEY'); 
+
+// in this example we are using guzzlehttp/guzzle package, it can be any PSR-18 HTTP Client 
+// see: https://packagist.org/providers/psr/http-client-implementation
 $httpClient = \GuzzleHttp\Client();
 $api = new \Sysix\LexOffice\Api($apiKey, $httpClient);
 ```

composer.json

@@ -16,12 +16,13 @@
   "require": {
     "php": "^8.1",
     "ext-json": "*",
-    "ext-curl": "*",
-    "guzzlehttp/guzzle": "^6.2 | ^7.0"
+    "psr/http-client": "^1.0",
+    "guzzlehttp/psr7": "^2.0"
   },
   "require-dev": {
     "phpstan/phpstan": "^1.10",
-    "phpunit/phpunit": "^10.4"
+    "phpunit/phpunit": "^10.4",
+    "guzzlehttp/guzzle": "^7.8"
   },
   "suggest": {
     "kevinrob/guzzle-cache-middleware": "*",