Getting promise is not a function error on lambda execution logs

[tlopo]

Hi there,

I was getting error promise is not a function from https://github.com/disney/terraform-aws-kinesis-firehose-splunk/blob/master/files/kinesis-firehose-cloudwatch-logs-processor.js#L131:

const response = await client[methodName](args).promise()

While debugging I printed the return of client[methodName](args) and it was of type promise, so I changed it to:

const response = await client[methodName](args)

It solved my problem, so I thought I would let you guys know.

[tlopo]

Digging deeper on this issue, this is happening because it's now using aws-sdk v3:

below a snippet of code using aws-sdk v2:

var AWS = require("aws-sdk")

AWS.config.update({region: "eu-west-2"})

client  = new AWS.Firehose();

(async function(){
  r = await client.listDeliveryStreams({}).promise()
  console.log(r)    
})()

Using aws-sdk v3:

const { Firehose } = require("@aws-sdk/client-firehose");

( async function(){
    client =  new Firehose({region: "eu-west-2"})
    r = await client.listDeliveryStreams({})
    console.log(r)
})()

[mlcooper]

Fixed in #38