Workaround for Twitter bug

For some reason, reply threads with only "unavailable" tweets get the tag
`ThreadedConversation--selfThread`, which is only meant to be used for replies
that are actually part of the thread you're viewing. To fix this we simply only
check "self" for the first reply.

src/parser.nim

@@ -102,11 +102,11 @@ proc parseConversation*(node: XmlNode): Conversation =
   let replies = node.select(".replies-to .stream-items")
   if replies == nil: return
 
-  for reply in replies.filterIt(it.kind != xnText):
+  for i, reply in replies.filterIt(it.kind != xnText):
     let class = reply.attr("class").toLower()
     let thread = reply.select(".stream-items")
 
-    if "self" in class:
+    if i == 0 and "self" in class:
       result.after = parseThread(thread)
     elif "lone" in class:
       result.replies.add parseThread(reply)