How to properly use protoc-gen-prost-crate

[Morris Tai]

I encountered an issue when trying to run the example code from the README. However, protoc-gen-prost appears to be working. I found there's a PR about similar issue but it's based on serde/tonic fix.

Steps to reproduce

env: Arch linux 2023‑03‑01, Rust 1.70.0, Cargo 0.2.2

1. clone the repo
2. cd into folder root
3. Install protoc-gen-prost with cargo install --path protoc-gen-prost
4. Install protoc-gen-prost-crate with cargo install --path protoc-gen-prost-crate
5. mkdir proto/gen
6. run protoc --prost-crate_out=proto/gen -I proto proto/greeter/v1/greeter.proto