https://github.com/sendbird/sendbird-uikit-ios/releases/tag/v2.1.8
• Fixed an issue that failed to send typing status
• Fixed multiline text not functioning for statusLabel in SBUEmptyView class.
• Fixed multiple messages sending issue when sending a failed message.
• Changed access control to public
• setEditMode(for:) in SBUBaseChannelViewController class.
