Handling serde_json::from_slice errors

[taylor1791]

As far as I can tell, there is no way to handle request bodies that Serde fails to deserialize. In my case, I simply want to log it (and till fail the invocation), but another might want to manually put it in a dead letter queue.

1. Did I overlook something?
2. If this a desirable feature and you have an API in mind, I am happy to try and implement it.

[rimutaka]

@taylor1791 , we have PR #244 that addresses this issue sitting in the queue. It's been there for a while. You can use https://github.com/rimutaka/aws-lambda-rust-runtime/tree/davidbarsky/update-readme branch to get the error logging.
We've been using that branch for some weeks now. I'll be on standby if you run into any problems with it.

[taylor1791]

I was able to get that branch to serve all of my needs. Thank you for your guidance.

🤞 that the MR will land on master soon.