updated ci matrix

Author: transistive

.github/workflows/ci.yml

@@ -8,16 +8,15 @@ jobs:
     strategy:
       max-parallel: 10
       matrix:
-        php: [ '7.2', '7.3', '7.4']
-        sf_version: [ '4.4.*', '5.1.*' ]
+        php: [ '7.4', '8.0']
+        sf_version: [ '5.1.*', '5.0.*', '5.2.*', '5.3.*' ]
 
     steps:
       - name: Set up PHP
         uses: shivammathur/[email protected]
         with:
           php-version: ${{ matrix.php }}
           coverage: none
-          tools: flex
 
       - name: Checkout code
         uses: actions/checkout@v2