update middleware and config

app/Http/Middleware/RedirectIfAuthenticated.php

@@ -3,28 +3,10 @@
 namespace App\Http\Middleware;
 
 use Closure;
-use Illuminate\Contracts\Auth\Guard;
+use Illuminate\Support\Facades\Auth;
 
 class RedirectIfAuthenticated
 {
-    /**
-     * The Guard implementation.
-     *
-     * @var Guard
-     */
-    protected $auth;
-
-    /**
-     * Create a new filter instance.
-     *
-     * @param  Guard  $auth
-     * @return void
-     */
-    public function __construct(Guard $auth)
-    {
-        $this->auth = $auth;
-    }
-
     /**
      * Handle an incoming request.
      *
@@ -34,7 +16,7 @@ class RedirectIfAuthenticated
      */
     public function handle($request, Closure $next)
     {
-        if ($this->auth->check()) {
+        if (Auth::check()) {
             return redirect('/home');
         }