Allow users to install illuminate/support 5.6.* if they choose

Author: Jaspaul

composer.json

@@ -22,7 +22,7 @@
         "php" : ">=7.0.10",
         "league/csv": "~9.0",
         "mustangostang/spyc": "~0.6",
-        "illuminate/support": "5.5.x"
+        "illuminate/support": "~5.5"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7 || ^6.5"