Show that we support PHP8 (#238)

Nyholm · web-flow · commit 9df4e5d1c98f · 2020-11-27T16:32:20.000+01:00
diff --git a/composer.json b/composer.json
@@ -19,7 +19,7 @@
         }
     ],
     "require": {
-        "php": "^5.6 || ^7.0",
+        "php": "^5.6 || ^7.0 || ^8.0",
         "psr/cache": "^1.0",
         "cache/hierarchical-cache": "^1.0"
     },
