add event description to twitter

twitter_bot.py

@@ -67,6 +67,9 @@ message = [
     "\n",
     next_event.title,
     "\n",
+    "" if next_event.description is "" else "\n",
+    next_event.description,
+    "" if next_event.description is "" else "\n\n",
     "%s?pk_campaign=twitter" % next_event.link
 ]