Limit bookmark items on completion

src/background/usecases/completions.js

@@ -183,10 +183,11 @@ export default class CompletionsInteractor {
 
   async queryBookmarkItems(name, keywords) {
     let bookmarks = await this.completionRepository.queryBookmarks(keywords);
-    return bookmarks.map(page => new CompletionItem({
+    return bookmarks.slice(0, COMPLETION_ITEM_LIMIT)
-      caption: page.title,
+      .map(page => new CompletionItem({
-      content: name + ' ' + page.url,
+        caption: page.title,
-      url: page.url
+        content: name + ' ' + page.url,
-    }));
+        url: page.url
+      }));
   }
 }