Update composer.json

Author: freekmurze

composer.json

@@ -22,7 +22,7 @@
     ],
     "require": {
         "php" : ">=5.5.0",
-        "league/fractal": "^0.13",
+        "league/fractal": "^0.13.0",
         "illuminate/support": "^5.1"
     },
     "require-dev": {