Remove trailing comma.

plugin.rb

@@ -14,7 +14,7 @@ after_initialize do
               .order("posts.score DESC")
               .for_mailing_list(user, @since)
               .where("posts.post_type = ?", Post.types[:regular])
-              .where("posts.deleted_at IS NULL AND posts.hidden = false AND posts.user_deleted = false",)
+              .where("posts.deleted_at IS NULL AND posts.hidden = false AND posts.user_deleted = false")
               .where("posts.post_number > ?", 1)
               .where("posts.created_at < ?", (SiteSetting.editing_grace_period || 0).seconds.ago)
               .limit(SiteSetting.digest_posts)