add previous events to result if added

src/scrape-event.js

@@ -33,6 +33,15 @@ const options = parse_args(process.argv.slice(2));
     }
   }
 
+  let i = 0;
+  for (const event of previous_events) {
+    i = events.findIndex(({ id }) => id === event.id);
+    if (i === -1) {
+      events.push(event);
+    }
+    i = 0;
+  }
+
   const filterAwayFields = omit([
     'ad_groups',
     'ads_data',