Make it work with psr18 and httplug 2.0

Author: joelwurtz

composer.json

@@ -11,16 +11,16 @@
     "require": {
         "php": "^7.1",
         "symfony/options-resolver": "^2.6 || ^3.0 || ^4.0",
-        "php-http/httplug": "^1.0",
-        "php-http/message-factory": "^1.0.2",
+        "php-http/httplug": "^1.0 || ^2.0",
+        "php-http/message-factory": "^1.0.2 || ^2.0",
         "php-http/discovery": "^1.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.2",
         "guzzlehttp/psr7": "^1.2",
-        "php-http/client-integration-tests": "^0.6",
+        "php-http/client-integration-tests": "^1.0 || ^2.0",
         "php-http/message": "^1.0",
-        "php-http/client-common": "^1.0"
+        "php-http/client-common": "^1.0 || ^2.0"
     },
     "provide": {
         "php-http/client-implementation": "1.0"
@@ -43,7 +43,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.1-dev"
+            "dev-master": "2.0-dev"
         }
     },
     "prefer-stable": true,

src/Client.php

@@ -9,6 +9,7 @@
 use Http\Discovery\MessageFactoryDiscovery;
 use Http\Message\ResponseFactory;
 use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -62,7 +63,7 @@ public function __construct(ResponseFactory $responseFactory = null, array $conf
     /**
      * {@inheritdoc}
      */
-    public function sendRequest(RequestInterface $request)
+    public function sendRequest(RequestInterface $request): ResponseInterface
     {
         $remote = $this->config['remote_socket'];
         $useSsl = $this->config['ssl'];