title: AWS : The security token included in the request is invalid
body: <p>Running the lambda locally and I get the error.</p>
  
  <pre><code>AWS.config.update({
    region: 'ap-southeast-1',
    accessKey: 'xx',
    secretAccessKey: 'xxx',
  });
  
  
  { UnrecognizedClientException: The security token included in the request is invalid.
      at Request.extractError (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\protocol\json.js:48:27)
      at Request.callListeners (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\sequential_executor.js:105:20)
      at Request.emit (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\sequential_executor.js:77:10)
      at Request.emit (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\request.js:683:14)
      at Request.transition (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\request.js:22:10)
      at AcceptorStateMachine.runTo (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\state_machine.js:14:12)
      at D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\state_machine.js:26:10
      at Request.&lt;anonymous&gt; (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\request.js:38:9)
      at Request.&lt;anonymous&gt; (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\request.js:685:12)
      at Request.callListeners (D:\Work\Amazon\BillingAggregator\billing-file-sender\node_modules\aws-sdk\lib\sequential_executor.js:115:18)
    message: 'The security token included in the request is invalid.',
    code: 'UnrecognizedClientException',
    time: 2018-08-03T08:21:29.493Z,
    requestId: 'e07f905c-0bbf-4508-8f79-ca0dc9348867',
    statusCode: 400,
  </code></pre>