issue/console: Update minimum php version to 7.1

Author: cambell-prince

composer.json

@@ -11,7 +11,7 @@
     }
   ],
   "require": {
-    "php": ">5.6",
+    "php": ">7.1",
     "symfony/console": "^4.0"
   },
   "require-dev": {