This fork has a fix:
So, just change in trellis/requirements.yml
- name: aws-cli
src: https://github.com/dstil/ansible-aws-cli
version: 5c1c14d9b0e6264605bd475c86d4ea67e7d5896f
to
- name: aws-cli
src: https://github.com/3stack-software/ansible-aws-cli
version: 67f6a400de7ef2260a5d0a64a5cb98156b65efaf