Remove v13 deprecations

src/Auditable.php

@@ -361,14 +361,6 @@ protected function resolveUser()
 
         $userResolver = Config::get('audit.user.resolver');
 
-        if (is_null($userResolver) && Config::has('audit.resolver') && ! Config::has('audit.user.resolver')) {
-            trigger_error(
-                'The config file audit.php is not updated to the new version 13.0. Please see https://laravel-auditing.com/guide/upgrading.html',
-                E_USER_DEPRECATED
-            );
-            $userResolver = Config::get('audit.resolver.user');
-        }
-
         if (is_subclass_of($userResolver, \OwenIt\Auditing\Contracts\UserResolver::class)) {
             return call_user_func([$userResolver, 'resolve'], $this);
         }
@@ -381,11 +373,9 @@ protected function runResolvers(): array
         $resolved = [];
         $resolvers = Config::get('audit.resolvers', []);
         if (empty($resolvers) && Config::has('audit.resolver')) {
-            trigger_error(
-                'The config file audit.php is not updated to the new version 13.0. Please see https://laravel-auditing.com/guide/upgrading.html',
-                E_USER_DEPRECATED
+            throw new AuditingException(
+                'The config file audit.php is not updated. Please see https://laravel-auditing.com/guide/upgrading.html'
             );
-            $resolvers = Config::get('audit.resolver', []);
         }
 
         foreach ($resolvers as $name => $implementation) {

src/Contracts/Resolver.php

@@ -4,6 +4,6 @@
 
 interface Resolver
 {
-    /** @return string */
+    /** @return mixed */
     public static function resolve(Auditable $auditable);
 }