Update changelog

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

Author: NobodyXu

src/changelog.rs

@@ -4,8 +4,6 @@ use crate::*;
 /// TODO: RENAME THIS INTO THE NEXT VERSION BEFORE RELEASE
 ///
 /// ## Added
-///  - Implement [`openssh_sftp_client::Writer`] for `ChildStdin`
-///    if feature `openssh-sftp-client` is enabled.
 ///  - [`Session::subsystem`]
 #[doc(hidden)]
 pub mod unreleased {}