Fixed ConnectionInterface inconsistency

Author: ezimuel

src/Elasticsearch/Connections/Connection.php

@@ -190,7 +190,7 @@ public function __construct(
     /**
      * @param  string    $method
      * @param  string    $uri
-     * @param  array     $params
+     * @param  null|array   $params
      * @param  null      $body
      * @param  array     $options
      * @param  Transport $transport

src/Elasticsearch/Connections/ConnectionInterface.php

@@ -75,5 +75,5 @@ public function getLastRequestInfo(): array;
      * @param  null $body
      * @return mixed
      */
-    public function performRequest(string $method, string $uri, array $params = [], $body = null, array $options = [], Transport $transport = null);
+    public function performRequest(string $method, string $uri, ?array $params = [], $body = null, array $options = [], Transport $transport = null);
 }