Add missing error case

lib/frenzy/update_feeds.ex

@@ -87,6 +87,9 @@ defmodule Frenzy.UpdateFeeds do
         case FeedParser.parse(body, content_type) do
           {:ok, rss} ->
             update_feed_from_rss(feed, rss)
+
+          {:error, reason} ->
+            Logger.error("Unable to parse feed at '#{feed.feed_url}': #{inspect(reason)}")
         end
 
       {:ok, %HTTPoison.Response{status_code: 404}} ->