adding php 8.0 and 8.1 to the matrix

Author: alessandro

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['7.2', '7.3', '7.4']
+        php-version: ['7.2', '7.3', '7.4', '8.0', '8.1']
         rts-version: ['1.4.8', 'edge']
     continue-on-error: ${{ matrix.rts-version == 'edge' }}
     services: