mention received and expected response status code when failing

Author: artjomsimon

src/AbstractRequester.php

@@ -210,7 +210,7 @@ public function send()
         // Assert results
         if ($this->statusExpected != $statusReturned) {
             throw new StatusCodeNotMatchedException(
-                "Status code not matched $statusReturned",
+                "Status code not matched: Expected {$this->statusExpected}, got {$statusReturned}",
                 $responseBody
             );
         }