Update composer.json to support laravel 5.8.*

Author: juampi92

composer.json

@@ -12,9 +12,9 @@
     ],
     "require": {
       "php": ">=7.0.0",
-      "illuminate/support": "5.5.*||5.6.*||5.7.*",
-      "illuminate/http": "5.5.*||5.6.*||5.7.*",
-      "illuminate/database": "5.5.*||5.6.*||5.7.*"
+      "illuminate/support": "5.5.*||5.6.*||5.7.*||5.8.*",
+      "illuminate/http": "5.5.*||5.6.*||5.7.*||5.8.*",
+      "illuminate/database": "5.5.*||5.6.*||5.7.*||5.8.*"
     },
     "require-dev": {
       "orchestra/testbench": "~3.5",