Support PHP 8

Author: Naktibalda

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [5.6, 7.0, 7.1, 7.2, 7.3, 7.4]
+        php: [5.6, 7.0, 7.1, 7.2, 7.3, 7.4, 8.0]
 
     steps:
     - name: Checkout code

composer.json

@@ -15,7 +15,7 @@
     ],
     "minimum-stability": "RC",
     "require": {
-        "php": ">=5.6.0 <8.0",
+        "php": ">=5.6.0 <9.0",
         "guzzlehttp/guzzle": "^6.3.0|^7.0.0",
         "codeception/lib-innerbrowser": "^1.3.2",
         "codeception/codeception": "*@dev"