message: upgrade shadowbox to shadowsocks-libev 3.2.0
diff: FROM node:8.10.0-alpine
  # Versions can be found at https://github.com/shadowsocks/shadowsocks-libev/releases
  -ARG SS_VERSION=3.1.3
  +ARG SS_VERSION=3.2.0
  # Save metadata on the software versions we are using.
  LABEL shadowbox.node_version=8.10.0
  