replace nyholm/psr7 to guzzlehttp/psr7 for PHP 7.0 support

Author: ddrv

composer.json

@@ -16,7 +16,7 @@
     "psr/http-client": "^1.0"
   },
   "require-dev": {
-    "nyholm/psr7": "^1.3",
+    "guzzlehttp/psr7": "^1.7",
     "phpunit/phpunit": ">=6.5",
     "squizlabs/php_codesniffer": "^3.5",
     "webclient/fake-http-client": "^1.0"

stuff/Handler.php

@@ -4,7 +4,7 @@
 
 namespace Stuff\Webclient\Extension\ProtocolVersion;
 
-use Nyholm\Psr7\Response;
+use GuzzleHttp\Psr7\Response;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;

tests/ClientTest.php

@@ -5,7 +5,7 @@
 namespace Tests\Webclient\Extension\ProtocolVersion;
 
 use Stuff\Webclient\Extension\ProtocolVersion\Handler;
-use Nyholm\Psr7\Request;
+use GuzzleHttp\Psr7\Request;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Client\ClientExceptionInterface;
 use Webclient\Extension\ProtocolVersion\Client;