Require PHP 7

composer.json

@@ -24,7 +24,7 @@
         "source": "https://gitlab.lakedrops.com/composer/library/dotenv/tree/master"
     },
     "require": {
-        "php": ">=5.6",
+        "php": ">=7.0",
         "lakedrops/composer-json-utils": "^1.4.1",
         "symfony/dotenv": "^3.3"
     },