Support for Symfony 4 (#115)

Author: Nyholm

composer.json

@@ -18,8 +18,8 @@
         "php": ">=7.0.0",
         "ext-filter": "*",
         "coduo/php-to-string": "^2",
-        "symfony/property-access": "^2.3|^3.0",
-        "symfony/expression-language": "^2.3|^3.0",
+        "symfony/property-access": "^2.3|^3.0|^4.0",
+        "symfony/expression-language": "^2.3|^3.0|^4.0",
         "doctrine/lexer": "1.0.*",
         "openlss/lib-array2xml": "~0.0.9"
     },