Update composer.json

Update composer.json for support laravel 8

Author: andryshok

composer.json

@@ -13,8 +13,8 @@
     "php": ">=5.4.0",
     "tedivm/jshrink": "~1.0",
     "natxet/cssmin": "3.*",
-    "illuminate/filesystem": "~5.0|^6|^7",
-    "illuminate/support": "~5.0|^6|^7"
+    "illuminate/filesystem": "~5.0|^6|^7|^8",
+    "illuminate/support": "~5.0|^6|^7|^8"
   },
   "require-dev": {
     "phpspec/phpspec": "2.0.0",