Only run phpcs on 7.2

Author: TamasSzigeti

.github/workflows/continuous_integration.yml

@@ -82,6 +82,7 @@ jobs:
 
       - name: "Run coding standard checks with squizlabs/php_codesniffer"
         run: "composer cs-check"
+        if: ${{ matrix.php-version == '7.2' }} # Do not suggest using features after 7.2
 
       - name: "Archive code coverage results"
         uses: actions/upload-artifact@v2.2.4