update: remove rnd from security-iv-printable-prefix feature (#844)
update: remove rnd from security-iv-printable-prefix feature (#844)

Co-authored-by: ty <50c3beb1947b33c2ee6dd1cba2c03e2aeb83abdc@users.noreply.github.com>
shadowsocks/shadowsocks-rust,shadowsocks/shadowsocks-rust,shadowsocks/shadowsocks-rust,shadowsocks/shadowsocks-rust