Add support for new fields in payload.

src/hook_push.rs

@@ -113,6 +113,8 @@ pub(crate) struct HookRepository {
     object_format_name: String,
     mirror_updated: String, // TODO: parse to datetime
     repo_transfer: Value,   // Was null in test hook
+    topics: Value,          // Was null in test hook
+    licenses: Value,        // Was null in test hook
 }
 
 #[allow(dead_code)]