update to prost 0.12 #397

	name: Continuous Integration

	on: [push, pull_request, workflow_dispatch]

	jobs:
	build:
	name: Build and check formatting
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Install latest Rust
	uses: actions-rust-lang/setup-rust-toolchain@v1
	with:
	toolchain: stable
	rustflags: ""
	- name: Execute all tests
	run: ./tests/ci.sh

	build-msrv:
	name: MSRV - Build and check formatting
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Install Rust MSRV
	uses: actions-rust-lang/setup-rust-toolchain@v1
	with:
	toolchain: 1.66.0
	rustflags: ""
	- name: Execute all tests
	run: ./tests/ci.sh

	links:
	name: Check links
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Link Checker
	uses: peter-evans/link-checker@v1
	with:
	args: -v -r *.md
	- name: Fail if there were link errors
	run: exit ${{ steps.lc.outputs.exit_code }}

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