update stream dependency

Author: pterk

composer.json

@@ -14,7 +14,7 @@
         "php": ">=5.5.0",
         "illuminate/support": ">=4.2",
         "illuminate/database": ">=4.2",
-        "get-stream/stream": "^3.0"
+        "get-stream/stream": "^4.0.1"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",