Fix composer.json

Author: yukato

composer.json

@@ -21,7 +21,8 @@
     "illuminate/database": "~4.2|^5",
     "illuminate/config": "~4.2|^5",
     "nesbot/carbon": "~1.0",
-    "elasticsearch/elasticsearch": ">1.0 <2.2"
+    "elasticsearch/elasticsearch": ">1.0 <2.2",
+    "aws/aws-sdk-php": "^3.18"
   },
   "require-dev": {
     "phpunit/phpunit": "~4.2|~5.0",