Update heck requirement from 0.3 to 0.4 #8

	name: test
	on:
	pull_request:

	env:
	RUST_BACKTRACE: 1

	# Spend CI time only on latest ref: https://docs.github.com/en/actions/using-jobs/using-concurrency
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	unit:
	strategy:
	# Prevent GitHub from cancelling all in-progress jobs when a matrix job fails.
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	runs-on: ${{ matrix.os }}
	steps:
	- uses: actions/checkout@v4
	- uses: actions-rs/toolchain@v1
	with:
	override: true
	toolchain: stable
	profile: minimal
	# Smart caching for Rust projects.
	# Includes workaround for macos cache corruption.
	# - https://github.com/rust-lang/cargo/issues/8603
	# - https://github.com/actions/cache/issues/403
	- uses: Swatinem/rust-cache@v2

	# Real CI work starts here
	- name: Build workspace
	run: cargo build

	- name: Run workspace unit tests
	run: cargo test --workspace --lib
	- name: Run workspace doc tests
	run: cargo test --workspace --doc
	if: false # currently go doc generates stuff that rust expects to be valid symbols

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