Update composer.json

Author: nckg

composer.json

@@ -12,7 +12,7 @@
         "php" : "^7.0"
     },
     "require-dev": {
-        "illuminate/support": "~5.1.0|~5.2.0|~5.3.0",
+        "illuminate/support": "~5.1.0|~5.2.0|~5.3.0|~5.4.0",
         "phpunit/phpunit": "5.*",
         "orchestra/testbench": "^3.2",
         "mockery/mockery": "^0.9.4"