Fix lack of Command Validating middleware

app/Foundation/Providers/AppServiceProvider.php

@@ -12,6 +12,7 @@
 namespace CachetHQ\Cachet\Foundation\Providers;
 
 use AltThree\Bus\Dispatcher;
+use AltThree\Validator\ValidatingMiddleware;
 use CachetHQ\Cachet\Bus\Middleware\UseDatabaseTransactions;
 use CachetHQ\Cachet\Services\Dates\DateFactory;
 use Illuminate\Database\Eloquent\Relations\Relation;
@@ -41,7 +42,7 @@ class AppServiceProvider extends ServiceProvider
             return Dispatcher::simpleMapping($command, 'CachetHQ\Cachet\Bus', 'CachetHQ\Cachet\Bus\Handlers');
         });
 
-        $dispatcher->pipeThrough([UseDatabaseTransactions::class]);
+        $dispatcher->pipeThrough([UseDatabaseTransactions::class, ValidatingMiddleware::class]);
 
         Str::macro('canonicalize', function ($url) {
             return preg_replace('/([^\/])$/', '$1/', $url);