add PHP 7.0 support

Author: terrafrost

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
         PHP_VERSION: [
           '4.4',
           '5.0', '5.1', '5.2', '5.3', '5.4', '5.5', '5.6',
-          '7.1', '7.2', '7.3', '7.4',
+          '7.0', '7.1', '7.2', '7.3', '7.4',
           '8.0', '8.0jit', '8.1', '8.1jit', '8.2', '8.2jit', '8.3', '8.3jit'
         ]
     runs-on: ubuntu-latest