Update edition and CI script, and add Cargo.lock.msrv #290

	name: Rust CI
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	rust: ["1.61", stable, beta, nightly]
	steps:
	- uses: actions/checkout@v2
	- uses: dtolnay/rust-toolchain@v1
	with:
	toolchain: ${{ matrix.rust }}
	- name: Cache Cargo Dependencies
	uses: Swatinem/rust-cache@v2
	with:
	cache-on-failure: true
	- name: Install MSRV Cargo.lock
	if: ${{ matrix.rust == '1.61.0' }}
	run: mv Cargo.lock.msrv Cargo.lock
	- name: build
	run: cargo build -v
	- name: test
	if: ${{ matrix.rust != '1.61.0' }}
	run: cargo test -v && cargo doc -v

	rustfmt:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: dtolnay/rust-toolchain@stable
	with:
	components: rustfmt
	- name: Run rustfmt check
	run: cargo fmt -- --check

	clippy:
	runs-on: ubuntu-latest
	continue-on-error: true # Until we fix all clippy warnings
	steps:
	- uses: actions/checkout@v2
	- uses: dtolnay/rust-toolchain@stable
	with:
	components: clippy
	- run: cargo clippy --all-features -- -D warnings

	verify_msrv:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Install or use cached `cargo-msrv`
	uses: baptiste0928/cargo-install@v1
	with:
	crate: cargo-msrv
	- name: Install MSRV Cargo.lock
	run: mv Cargo.lock.msrv Cargo.lock
	- name: Verify Minimum Rust Version
	run: cargo-msrv verify

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