Automatically select profile when AWS_PROFILE environment variable is set

[nl-brett-stime]

Expected Behavior

Optional new usage for those of us who wish to type less:

export AWS_PROFILE=foo
gimme-aws-creds                 # After the PR, gimme will recognize the same environment variable as the AWS CLI and SDK.
aws s3 ls                                # The AWS CLI already recognizes the AWS_PROFILE environment variable
aws ec2 describe-instances
terraform apply                      # Other tools built on an AWS SDK already recognize the AWS_PROFILE environment variable

Current Behavior

E.g., Existing usage with many explicit profile references:

gimme-aws-creds --profile foo
aws --profile foo s3 ls
aws --profile foo ec2 describe-instances
AWS_PROFILE=foo terraform apply

Possible Solution

PR inbound

[jcreyf]

I need this too but was not aware of this issue and PR for this request.
I basically created my own implementation with basically just 1 line change in config.py (I did add 2 more lines to display the selected profile on the console to inform the user).
https://github.com/jcreyf/gimme-aws-creds/blob/e4a5e5a43715dcbf436e4a2bb8d4e5a490571761/gimme_aws_creds/config.py#L177