Merge pull request #159 from arkolka/master

Add thread_ts to PostEphemeral

Author: soxtoby

SlackNet/WebApi/ChatApi.cs

@@ -221,6 +221,7 @@ public Task<PostMessageResponse> PostEphemeral(string userId, Message message, C
                     { "attachments", message.Attachments },
                     { "blocks", message.Blocks },
                     { "link_names", message.LinkNames },
+                    { "thread_ts", message.ThreadTs },
                     { "parse", message.Parse }
                 },
             cancellationToken);
@@ -281,4 +282,4 @@ public Task<MessageUpdateResponse> Update(MessageUpdate messageUpdate, Cancellat
                     { "file_ids", messageUpdate.FileIds }
                 },
             cancellationToken);
-}
+}