update laravel version

Author: ctf0

composer.json

@@ -19,9 +19,9 @@
    ],
     "require": {
         "php" : "~7.0",
-       "illuminate/support": "~5.4.0|~5.5.0|~5.6.0|~5.7.0",
-       "maennchen/zipstream-php": "~1.0",
-       "ctf0/package-changelog": "^1.0"
+        "illuminate/support": "~5.4.0|~5.5.0|~5.6.0|~5.7.0|~5.8.0",
+        "maennchen/zipstream-php": "~1.0",
+        "ctf0/package-changelog": "^1.0"
     },
     "suggest": {
         "league/flysystem-cached-adapter": "Required to use the Flysystem cache (~1.0)."