support laravel 5.6

Author: streamtw

composer.json

@@ -27,11 +27,11 @@
     "ext-exif": "*",
     "ext-fileinfo": "*",
     "intervention/image": "2.*",
-    "illuminate/config": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.*",
-    "illuminate/filesystem": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.*",
-    "illuminate/support": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.*",
-    "illuminate/http": "5.1.* || 5.2.* || 5.3.* || 5.4.* || 5.5.*",
-    "illuminate/container": "5.4.* || 5.5.*"
+    "illuminate/config": "5.4.* || 5.5.* || 5.6.*",
+    "illuminate/filesystem": "5.4.* || 5.5.* || 5.6.*",
+    "illuminate/support": "5.4.* || 5.5.* || 5.6.*",
+    "illuminate/http": "5.4.* || 5.5.* || 5.6.*",
+    "illuminate/container": "5.4.* || 5.5.* || 5.6.*"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.2",