support temp keys

[bAndie91]

i found this tool while searching for a proxy to sign aws api requests coming from applications which do not support temporary aws access keys, i.e. not access key + secret key pair, but access + secret + session key triplet.

i see it already uses some module which looks like aws go sdk.
would it be feasible to support --profile option and utizile aws sdk built-in logic to get the appropriative key pair / key triplet from default credentials file (aka. shared credentials file) according to the given profile name?

or just support --session-token for let aws sign with the temporary key triplet?

thanks for consideration.