feat: Allow to pass custom configuration

example.php

@@ -2,7 +2,7 @@
 
 require __DIR__ . '/vendor/autoload.php';
 
-$access_token = '<ACCESS_TOKEN>'; # testing program builder key
+$access_token = '<ACCESS_TOKEN>';
 
 $connection = new Eduframe\Connection();
 

src/Connection.php

@@ -36,6 +36,11 @@ class Connection
      */
     private $client;
 
+    /**
+     * @var Configuration
+     */
+    private $clientConfig;
+
     /**
      * @var array Middlewares for the Guzzle 6 client
      */
@@ -46,6 +51,14 @@ class Connection
      */
     private $stage = PRODUCTION;
 
+    /**
+     * Eduframe constructor.
+     * @param \Eduframe\Connection $connection
+     */
+    public function __construct(array $clientConfig = []) {
+        $this->clientConfig = $clientConfig;
+    }
+
     /**
      * @return Client
      */
@@ -59,13 +72,15 @@ private function client() {
             $handlerStack->push($middleWare);
         }
 
-        $args = [
+        $defaultClientConfig = [
             'http_errors' => true,
             'handler'     => $handlerStack,
             'expect'      => false,
         ];
 
-        $this->client = new Client($args);
+        $clientConfig = array_merge($defaultClientConfig, $this->clientConfig);
+
+        $this->client = new Client($clientConfig);
 
         return $this->client;
     }