Can't find credentials when using role_arn in INI

[Octogonapus]

I'll have time to work on this later but filing this for now.

# ~/.aws/credentials
[default]
role_arn=arn:aws:iam::foo:bar:baz
source_profile=jump

[jump]
aws_access_key_id=xxx
aws_secret_access_key=xxx

# ~/.aws/credentials
[default]
region = xxx

The AWS CLI correctly uses jump to assume the role in default, but this package throws an error:

julia> aws_config = AWS.AWSConfig()
ERROR: Can't find AWS credentials!

Stacktrace:
 [1] AWSCredentials(; profile::Nothing, throw_cred_error::Bool)
   @ AWS ~/.julia/packages/AWS/ZEOyZ/src/AWSCredentials.jl:145
 [2] AWSCredentials
   @ ~/.julia/packages/AWS/ZEOyZ/src/AWSCredentials.jl:113 [inlined]
 [3] AWSConfig()
   @ AWS ~/.julia/packages/AWS/ZEOyZ/src/AWSConfig.jl:32