Migrate to Laravel 5.3

app/Http/Middleware/Authenticate.php

@@ -1,30 +0,0 @@
-<?php
-
-namespace App\Http\Middleware;
-
-use Closure;
-use Illuminate\Support\Facades\Auth;
-
-class Authenticate
-{
-    /**
-     * Handle an incoming request.
-     *
-     * @param  \Illuminate\Http\Request  $request
-     * @param  \Closure  $next
-     * @param  string|null  $guard
-     * @return mixed
-     */
-    public function handle($request, Closure $next, $guard = null)
-    {
-        if (Auth::guard($guard)->guest()) {
-            if ($request->ajax() || $request->wantsJson()) {
-                return response('Unauthorized.', 401);
-            } else {
-                return redirect()->guest('login');
-            }
-        }
-
-        return $next($request);
-    }
-}