Merge pull request #166 from SparkPost/temp-composer-fix

Quick fix for using the API without composer

Author: rajumsys

README.md

@@ -44,6 +44,8 @@ require 'vendor/autoload.php';
 use SparkPost\SparkPost;
 ```
 
+**Note:** Without composer the costs outweight the benefits of using the PHP client library. A simple function like the one in [issue #164](https://github.com/SparkPost/php-sparkpost/issues/164#issuecomment-289888237) wraps the SparkPost API and makes it easy to use the API without resolving the composer dependencies. 
+
 ## Setting up a Request Adapter
 
 Because of dependency collision, we have opted to use a request adapter rather than