Merge pull request #4 from keithbrink/analysis-XlaayO

Apply fixes from StyleCI

Author: keithbrink

src/AmazonCore.php

@@ -399,7 +399,7 @@ protected function checkResponse($r)
     public function setConfig($config)
     {
         if (!$this->validateAndSetConfig($config)) {
-            throw new \Exception("Configuration values not set correctly. See log for details.");
+            throw new \Exception('Configuration values not set correctly. See log for details.');
         }
     }