Find TimelineAddEntries in tweets response (#1251)

See https://github.com/zedeus/nitter/issues/1250. Sometimes the API gives us more results
and the tweets are no longer at index 0.

src/parser.nim

@@ -364,7 +364,9 @@ proc parseGraphConversation*(js: JsonNode; tweetId: string; v2=true): Conversati
   if instructions.len == 0:
     return
 
-  for e in instructions[0]{"entries"}:
+  for i in instructions:
+    if i{"__typename"}.getStr == "TimelineAddEntries":
+      for e in i{"entries"}:
         let entryId = e{"entryId"}.getStr
         if entryId.startsWith("tweet"):
           with tweetResult, e{"content", contentKey, resultKey, "result"}: