Example
# Example
use awscreds::Credentials;
let credentials = Credentials::default();
let credentials = Credentials::new(None, None, None, None);
let credentials = Credentials::new(None, None, None, Some("my-profile".into()));
use s3::credentials::Credentials;
let access_key = String::from("AKIAIOSFODNN7EXAMPLE");
let secret_key = String::from("wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY");
let credentials = Credentials::new(Some(access_key), Some(secret_key), None, None);
use std::env;
env::set_var("AWS_ACCESS_KEY_ID", "AKIAIOSFODNN7EXAMPLE");
env::set_var("AWS_SECRET_ACCESS_KEY", "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY");
let credentials = Credentials::new(None, None, None, None);