Send email if a crawl fails

[aidando73]

We get a notification now

But just need to verify that events from EventBus will throw them

[aidando73]

Ok: https://docs.aws.amazon.com/lambda/latest/operatorguide/invocation-modes.html

CloudWatch Events (event bridge) events are considered async. Thus it's likely that it will send the error message.

[aidando73]

Merged in by https://github.com/REslim30/adelaide-house-price-ticker/pull/18