use lower version of aws sdk php

Author: p-pichet

composer.json

@@ -30,7 +30,7 @@
     "doctrine/persistence": "^2.0|^3.0",
     "mongodb/mongodb": "^1.2",
     "pda/pheanstalk": "^3.1",
-    "aws/aws-sdk-php": "^3.319",
+    "aws/aws-sdk-php": "^3.290",
     "stomp-php/stomp-php": "^4.5|^5",
     "php-http/guzzle7-adapter": "^0.1.1",
     "php-http/client-common": "^2.2.1",