Don't require php7.1

Author: mateuszsip

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=7.1.0",
+        "php": ">=7.0.0",
         "ext-filter": "*",
         "coduo/php-to-string": "^2",
         "symfony/property-access": "^2.3|^3.0|^4.0",