Update composer.json

Author: barryvdh

composer.json

@@ -14,10 +14,10 @@
     }
   ],
   "require": {
-    "php": ">=5.6.0",
-    "illuminate/support": "5.1.x|5.2.x|5.3.x|5.4.x|5.5.x|5.6.x|5.7.x",
-    "illuminate/translation": "5.1.x|5.2.x|5.3.x|5.4.x|5.5.x|5.6.x|5.7.x",
-    "symfony/finder": "~2.3|~3.0|~4.0"
+    "php": ">=7",
+    "illuminate/support": "5.5.x|5.6.x|5.7.x",
+    "illuminate/translation": "5.5.x|5.6.x|5.7.x",
+    "symfony/finder": "~3.0|~4.0"
   },
   "autoload": {
     "psr-4": {