v0.4.3

This version made JustSessionDefaults public so that you can create your own Just sessions with one. For example, the following code creates a session that includes an Authorization header for all requests:

let defaults = JustSessionDefaults(headers: ["Authorization": "\(someAuthKey)"])
let just = JustOf<HTTP>(defaults: defaults)
just.post("http://httpbin.org/post") // this request will contain the Authorization header