Updated README.md

Author: alfonsof

awslambdahttprequest/README.md

@@ -26,6 +26,9 @@ It handles an AWS Lambda function that it is invoked by an http request. It show
  * Timeout: `3 sec`
  * The resources that the function's role has access to:
  * `Amazon CloudWatch Logs`
+ * The triggers:
+ * `API Gateway`
+ * Details below.
 
 * Write the code of the Lambda funtion.