Merge pull request #10 from notmd/laravel-8

#9 - Add support for Laravel 8

Author: vuongxuongminh

composer.json

@@ -19,14 +19,14 @@
     "require": {
         "php": "^7.1",
         "ignited/laravel-omnipay": "^3.2",
-        "illuminate/support": "^5.7 || ^6.0 || ^7.0",
+        "illuminate/support": "^5.7 || ^6.0 || ^7.0 || ^8.0",
         "phpviet/omnipay-onepay": "^1.0",
         "phpviet/omnipay-vnpay": "^1.0",
         "phpviet/omnipay-vtcpay": "^1.0",
         "phpviet/omnipay-momo": "^1.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^3.7 || ^4.0 || ^5.0"
+        "orchestra/testbench": "^3.7 || ^4.0 || ^5.0 || ^6.0"
     },
     "autoload": {
         "psr-4": {