Resolve failure with it_should_create_a_follow_without_notifications

Author: Brandin

src/NewTwitchApi/Resources/UsersApi.php

@@ -114,7 +114,7 @@ public function createUserFollow(string $bearer, string $fromId, string $toId, b
 
         $queryParamsMap[] = ['key' => 'to_id', 'value' => $toId];
 
-        if ($notifications !== null) {
+        if (!is_null($notifications)) {
             $queryParamsMap[] = ['key' => 'allow_notifications', 'value' => $notifications];
         }