Function toggle_bot_username_is_active 

pub async fn toggle_bot_username_is_active(
    bot_user_id: i64,
    username: String,
    is_active: bool,
    client_id: i32,
) -> Result<(), Error>

Changes active state for a username of a bot. The editable username can’t be disabled. May return an error with a message “USERNAMES_ACTIVE_TOO_MUCH” if the maximum number of active usernames has been reached. Can be called only if userTypeBot.can_be_edited == true

Arguments

• bot_user_id - Identifier of the target bot
• username - The username to change
• is_active - Pass true to activate the username; pass false to disable it
• client_id - The client id to send the request to