Fix cabal build with-examples

[greglaun-google]

I'm unable to build the examples from master on a stock Ubuntu VM. I'm building using cabal rather than stack.

Most recently, the build was broken by PR #110, which upgraded proto3-wire and proto3-suite.

The version released on Hackage (https://hackage.haskell.org/package/grpc-haskell) also fails to build.

Steps to reproduce:

1. Grab an Ubuntu Groovy VM
2. Run 'sudo apt-get update`
3. Install Nix following https://nixos.org/download.html
4. git clone https://github.com/awakesecurity/gRPC-haskell.git
5. Run nix-shell release.nix -A grpc-haskell.env, which succeeds.
6. Run cabal configure --enable-tests && cabal build && cabal test, which succeeds.
7. Finally, run cabal configure --enable-tests -f with-examples && cabal build && cabal test

Expected result: Build succeeds.

Actual result:

build fails with an error "The constructor ‘ServiceOptions’ should have 9 arguments, but has been given 8."

[Gabriella439]

Fix is up here: #115