Fix calls to authHandler method on ApiResource (#489)

Author: SecondeJK

src/ProactiveConnect/ClientFactory.php

@@ -13,7 +13,7 @@ public function __invoke(ContainerInterface $container): Client
         $api = $container->make(APIResource::class);
         $api->setIsHAL(false)
             ->setErrorsOn200(false)
-            ->setAuthHandler([new KeypairHandler()])
+            ->setAuthHandlers([new KeypairHandler()])
             ->setBaseUrl('https://api-eu.vonage.com/v0.1/bulk/');
 
         return new Client($api);

src/Secrets/ClientFactory.php

@@ -14,7 +14,7 @@ public function __invoke(FactoryInterface $container): Client
     {
         $api = $container->make(APIResource::class);
         $api->setBaseUri('/accounts')
-            ->setAuthHandler(new BasicHandler())
+            ->setAuthHandlers(new BasicHandler())
             ->setCollectionName('secrets');
 
         return new Client($api);

src/Users/ClientFactory.php

@@ -17,7 +17,7 @@ public function __invoke(ContainerInterface $container): Client
         $api
             ->setBaseUri('/v1/users')
             ->setCollectionName('users')
-            ->setAuthHandler(new KeypairHandler());
+            ->setAuthHandlers(new KeypairHandler());
 
         $hydrator = new ArrayHydrator();
         $hydrator->setPrototype(new User());

src/Verify2/ClientFactory.php

@@ -14,7 +14,7 @@ public function __invoke(ContainerInterface $container): Client
         $api = $container->make(APIResource::class);
         $api->setIsHAL(false)
             ->setErrorsOn200(false)
-            ->setAuthHandler([new KeypairHandler(), new BasicHandler()])
+            ->setAuthHandlers([new KeypairHandler(), new BasicHandler()])
             ->setBaseUrl('https://api.nexmo.com/v2/verify');
 
         return new Client($api);