Add PHP 8.2 in test matrix (#33)

Author: jdecool

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [ '7.1', '7.2', '7.3', '7.4', '8.0', '8.1' ]
+        php: [ '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2' ]
         prefer: [ 'lowest', 'stable' ]
 
     name: Test on PHP ${{ matrix.php }} with ${{ matrix.prefer }} composer prefer option