Update README.md

README.md

@@ -31,12 +31,10 @@ class Conversation:
         self,
         message_template=DEFAULT_MESSAGE_TEMPLATE,
         system_prompt=DEFAULT_SYSTEM_PROMPT,
-        role_mapping=None,
         start_token_id=1,
         bot_token_id=9225
     ):
         self.message_template = message_template
-        self.role_mapping = role_mapping or {}
         self.start_token_id = start_token_id
         self.bot_token_id = bot_token_id
         self.messages = [{