Add aws session token

[yurik94]

Hello,
Many thanks for this OS package!

I'm using it in a project deployed on AWS Lambda (Bref + Serverless framework), locally with Sail it worked but when deploying it on AWS I was getting:

Aws\Polly\Exception\PollyException
Error executing "SynthesizeSpeech" on "https://polly.eu-central-1.amazonaws.com/v1/speech"; AWS HTTP error: Client error: `POST https://polly.eu-central-1.amazonaws.com/v1/speech` resulted in a `403 Forbidden` response:
{"message":"The security token included in the request is invalid."}
 UnrecognizedClientException (client): The security token included in the request is invalid. - {"message":"The security token included in the request is invalid."}

I've added the AWS_SESSION_TOKEN config field which allows the AWS SDK to work even when using an assumed IAM role.

[luigel]

Hi @yurik94 Thank you for the PR. It is also great if you add some simple documentation in the README on how to use the token.

Added release for this in https://github.com/meemalabs/laravel-text-to-speech/releases/tag/v1.5.2

[danielbehrendt]

This PR seems to break previous implementations! Getting an error:

Undefined array key "token"

[Sergiobop]

Yeah, this one breaks my app too..

To fix it, i changed my tts.php config file to:

  'credentials' => [
                'key'     => env('AWS_ACCESS_KEY_ID', ''),
                'secret'  => env('AWS_SECRET_ACCESS_KEY', ''),
                'token'   => env('AWS_SESSION_TOKEN', ''), // ADDED THIS LINE
            ],

Maybe updating readme to reflect this is the way to go?

[BassemBouguerraIn]

@Sergiobop plz how get AWS_SESSION_TOKEN value