fix: add missing iterable value types

Author: JaZo

src/Client.php

@@ -34,6 +34,9 @@ public function sendRequest(RequestInterface $request): ResponseInterface
             ->toPsrResponse();
     }
 
+    /**
+     * @param  array<string, mixed>  $options
+     */
     public function send(RequestInterface $request, array $options = []): ResponseInterface
     {
         return $this->newPendingRequest()
@@ -42,6 +45,9 @@ public function send(RequestInterface $request, array $options = []): ResponseIn
             ->toPsrResponse();
     }
 
+    /**
+     * @param  array<string, mixed>  $options
+     */
     public function sendAsync(RequestInterface $request, array $options = []): PromiseInterface
     {
         /** @var \GuzzleHttp\Promise\PromiseInterface */
@@ -51,13 +57,19 @@ public function sendAsync(RequestInterface $request, array $options = []): Promi
             ->send($request->getMethod(), (string) $request->getUri(), array_merge(['body' => $request->getBody()], $options));
     }
 
+    /**
+     * @param  array<string, mixed>  $options
+     */
     public function request(string $method, $uri, array $options = []): ResponseInterface
     {
         return $this->newPendingRequest()
             ->send($method, (string) $uri, $options)
             ->toPsrResponse();
     }
 
+    /**
+     * @param  array<string, mixed>  $options
+     */
     public function requestAsync(string $method, $uri, array $options = []): PromiseInterface
     {
         /** @var \GuzzleHttp\Promise\PromiseInterface */