grpctestify 1.8.6

--- META ---
name: Options override example
tags: [options]

--- ENDPOINT ---
helloworld.Greeter/SayHello

--- OPTIONS ---
no_retry: false
retry: 3
retry_delay: 0.5
timeout: 10

--- REQUEST ---
{
  "name": "World"
}

--- RESPONSE ---
{
  "message": "Hello, World!"
}