Register Halcyon Service Provider

modules/system/providers.php

@@ -27,6 +27,7 @@ return [
      */
     October\Rain\Foundation\Providers\ArtisanServiceProvider::class,
     October\Rain\Database\DatabaseServiceProvider::class,
+    October\Rain\Halcyon\HalcyonServiceProvider::class,
     October\Rain\Filesystem\FilesystemServiceProvider::class,
     October\Rain\Parse\ParseServiceProvider::class,
     October\Rain\Html\HtmlServiceProvider::class,