v2: Updates

* Simplifies & beautifies everything
* Introduces a new Class system.
* Errors are defaulted to AWS's handler.
* New function names & more efficient handling.
* Should fix a majority of the errors.

Please read the README for more!

aws/GuzzleHttp/PrepareBodyMiddleware.php

@@ -66,6 +66,11 @@ class PrepareBodyMiddleware
         return $fn(Psr7\modify_request($request, $modify), $options);
     }
 
+    /**
+     * Add expect header
+     *
+     * @return void
+     */
     private function addExpectHeader(
         RequestInterface $request,
         array $options,