There are like 6 releases newer than the latest in portage. https://github.com/shadowsocks/shadowsocks-libev/releases
this bump would fix #634422 by the way.
the new shadowsocks-libev unbundle the libraries: libbloom, libcork, libipset, so we actually need to package them up first.
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=94bb74930c19a774aa2eac2b0131ff3c36b11d20 commit 94bb74930c19a774aa2eac2b0131ff3c36b11d20 Author: Yixun Lan <dlan@gentoo.org> Date: Thu Mar 1 18:34:41 2018 +0800 net-proxy/shadowsocks-libev: version bump 3.1.3