update reqs

Author: Elias Schneider

composer.json

@@ -10,7 +10,7 @@
         }
     },
     "require": {
-        "php": "~7.0",
+        "php": "~7.1",
         "phpstan/phpstan": "^0.10",
         "typo3/cms-core": "^8.7 || ^9.5",
         "typo3/cms-extbase": "^8.7 || ^9.5"