update deps

composer.json

@@ -5,15 +5,15 @@
     "license": "MIT",
     "type": "project",
     "require": {
-        "php": ">=7.0.0",
+        "php": ">=7.1.0",
         "fideloper/proxy": "~3.3",
-        "laravel/framework": "5.5.*",
+        "laravel/framework": "5.6.*",
         "laravel/tinker": "~1.0"
     },
     "require-dev": {
         "filp/whoops": "~2.0",
         "fzaninotto/faker": "~1.4",
-        "mockery/mockery": "0.9.*",
+        "mockery/mockery": "~1.0",
         "phpunit/phpunit": "~6.0"
     },
     "autoload": {
@@ -52,5 +52,6 @@
         "preferred-install": "dist",
         "sort-packages": true,
         "optimize-autoloader": true
-    }
+    },
+    "minimum-stability": "dev"
 }