Support PHP 8

Author: clue

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ jobs:
     strategy:
       matrix:
         php:
+          - 8.0
           - 7.4
           - 7.3
           - 7.2

README.md

@@ -312,8 +312,9 @@ $ composer require clue/zenity-react:^0.4.3
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
 
 This project aims to run on any platform and thus does not require any PHP
-extensions and supports running on legacy PHP 5.3 through current PHP 7+ and
+extensions and supports running on legacy PHP 5.3 through current PHP 8+ and
 HHVM.
+It's *highly recommended to use PHP 7+* for this project.
 
 Obviously, this library requires the Zenity binary itself.
 Zenity already ships with Ubuntu-based distributions and should not require any installation there.