Merge pull request #16 from stof/php_8_1

Add CI job on PHP 9.1

Author: stof

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [ '7.4', '8.0' ]
+                php: [ '7.4', '8.0', '8.1' ]
                 min_stability: [ '' ]
                 name_suffix: [ '' ]
                 composer_flags: [ '' ]