Andrew Goodnough

### Start from the Use-case When the event source mapping is created using the Lift plugin, the [functionResponseType attribute is set to "ReportBatchItemFailures"](https://github.com/getlift/lift/blob/master/src/constructs/aws/Queue.ts#L253). For whatever reason, this causes every message...

From the README.md: "However, the payload does already contain the params hash, so you can easily add it in manually using custom_options:" Should that read "However, the payload does **NOT**...