getReplies() deprecated method is still used in getConversationHistory()

[potpot59]

Describe the bug
Using the latest release (1.4), I got error about the getReplies() deprecation when using getConversationHistory().
I do not need replies and there is no way to disable the call of getReplies().

To Reproduce
Steps to reproduce the behavior:

1. call getConversationHistory() with setChannelId("XXXX")
2. Run
3. See error:

2020-01-23 ERROR [NioHttpClient-Callback-0] c.h.s.c.m.LiteMessage : Method getReplies() is now deprecated. Slack will stop supporting completely on Oct 18th 2019

Expected behavior
1 Don't use a deprecated method
2 Let choose whether to retrieve the replies or not

[szabowexler]

Thanks for the report! We're aware of the discomfort here -- we'll look to fix that to avoid the spam sometime in Q1.