Add ^8.0 to list of supported php versions

Author: fermino

composer.json

@@ -9,11 +9,11 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^5.6 || ^7.0"
+        "php": "^5.6 || ^7.0 || ^8.0"
     },
     "autoload": {
         "psr-4": {
             "lfkeitel\\phptotp\\": "src/"
         }
     }
-}
+}