handle the user with original awscli config

[yanganto]

dead10k at Reddit
Hi, I haven't tried out the tool yet, but one thing that pops out at me is that it has a separate config file from the standard AWS tools. As a user, I would expect it to "just work" with the same credentials config I use with the awscli (under ~/.aws), including with IAM sessions and profiles set by the AWS_PROFILE env var.