Warning: grpc: this formula has no --with-plugins option so it will be ignored!

[zeroasterisk]

$ brew install --with-plugins grpc
Warning: grpc: this formula has no --with-plugins option so it will be ignored!

The README has --with-plugins on instructions - not sure if this is just a readme update needed, or a bug of some sort.

$ brew info grpc
grpc: stable 1.8.3 (bottled), HEAD
Next generation open source RPC library and framework
https://www.grpc.io/
/usr/local/Cellar/grpc/1.8.3 (181 files, 14.5MB)
  Poured from bottle on 2018-01-09 at 08:40:18
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/grpc.rb
==> Dependencies
Build: autoconf ✘, automake ✘, libtool ✘
Required: c-ares ✔, openssl ✔, protobuf ✔, gflags ✔