error message trying to run it locally

Trying to run it locally output the following error message:
`entrypoint requires the handler name to be the first argument`

Related to this excerpt in the readme:
```

docker run \
    -i -e DOCKER_LAMBDA_USE_STDIN=1 \
    --rm \
    -v ${PWD}/target/lambda/release/output/{your-binary-name}:/var/task:ro,delegated \
    public.ecr.aws/lambda/provided:al2
```

