Add aws session token (#39)

* config.php: added AWS_SESSION_TOKEN support

* TextToSpeechManager.php: added token field to Credentials

This allows AWS to load also the AWS_SESSION_TOKEN in order for lambda to work as IAM key and secret are empty

Author: yurik94

config/config.php

@@ -96,6 +96,7 @@
             'credentials' => [
                 'key'     => env('AWS_ACCESS_KEY_ID', ''),
                 'secret'  => env('AWS_SECRET_ACCESS_KEY', ''),
+                'token'   => env('AWS_SESSION_TOKEN', ''),
             ],
 
             'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),

src/TextToSpeechManager.php

@@ -66,7 +66,7 @@ protected function setPollyClient(array $config, Credentials $credentials)
      */
     protected function getCredentials(array $credentials)
     {
-        return new Credentials($credentials['key'], $credentials['secret']);
+        return new Credentials($credentials['key'], $credentials['secret'], $credentials['token']);
     }
 
     /**