Update TCPHandler.lastActivity upon successful send of bytes.
Fixes https://github.com/shadowsocks/shadowsocks-windows/issues/2857
N
notsure2 committed
ede2fcacb26192351fa10256cf27607333a9e1bd
Parent: d8c9a7c
Fixes https://github.com/shadowsocks/shadowsocks-windows/issues/2857