Update some code, add security txt file.

app/Http/Controllers/Auth/LoginController.php

@@ -65,6 +65,7 @@ class LoginController extends Controller
      *
      * @return \Illuminate\Http\Response|\Symfony\Component\HttpFoundation\Response
      *
+     * @throws \RuntimeException
      * @throws \Illuminate\Validation\ValidationException
      */
     public function login(Request $request)
@@ -102,6 +103,7 @@ class LoginController extends Controller
      * @param CookieJar $cookieJar
      *
      * @return $this|\Illuminate\Http\RedirectResponse
+     * @throws \RuntimeException
      */
     public function logout(Request $request, CookieJar $cookieJar)
     {
@@ -119,6 +121,7 @@ class LoginController extends Controller
      * @param Request $request
      *
      * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
+     * @throws \RuntimeException
      */
     public function showLoginForm(Request $request)
     {