README Update: Add `--cli-binary-format raw-in-base64-out` to Invoke Command

[daniel-fudge]

With the CLI V2 update the invoke commands in the various README.md files need to be updated.

Related Docs: https://docs.aws.amazon.com/cli/latest/userguide/cliv2-migration.html#cliv2-migration-binaryparam.

Stackoverflow Discussion https://stackoverflow.com/questions/60310607/amazon-aws-cli-not-allowing-valid-json-in-payload-parameter