Update dependecies to laravel 5.6.39

composer.json

@@ -5,11 +5,12 @@
     "license": "MIT",
     "type": "project",
     "require": {
-        "php": ">=7.0.0",
+        "php": "^7.1.3",
         "backup-manager/laravel": "^1.2",
         "guzzlehttp/guzzle": "^6.3",
         "laracasts/presenter": "^0.2.1",
-        "laravel/framework": "5.5.*",
+        "fideloper/proxy": "^4.0",
+        "laravel/framework": "5.6.*",
         "luthfi/formfield": "^1.0",
         "riskihajar/terbilang": "^1.2",
         "spatie/laravel-fractal": "^5.0"
@@ -17,12 +18,11 @@
 
     "require-dev": {
         "barryvdh/laravel-debugbar": "^3.1",
-        "fzaninotto/faker": "~1.4",
-        "johnkary/phpunit-speedtrap": "^2.0",
-        "laravel/browser-kit-testing": "2.0.x-dev",
+        "fzaninotto/faker": "^1.4",
+        "johnkary/phpunit-speedtrap": "^3.0",
         "luthfi/simple-crud-generator": "^1.2",
-        "mockery/mockery": "~1.0",
-        "phpunit/phpunit": "~6.0"
+        "mockery/mockery": "^1.0",
+        "phpunit/phpunit": "^7.0"
     },
     "autoload": {
         "classmap": [
@@ -60,5 +60,7 @@
         "preferred-install": "dist",
         "sort-packages": true,
         "optimize-autoloader": true
-    }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }