Bump min php requirement to 7.0

LKaemmerling · LKaemmerling · commit 32bb15d08d60 · 2018-01-05T14:06:04.000+01:00
diff --git a/composer.json b/composer.json
@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=5.6.4",
+        "php": ">=7.0.0",
         "berkayk/onesignal-laravel": "^0.9.3",
         "illuminate/notifications": "5.*",
         "illuminate/support": "5.*"
