Updated version, README, and CHANGELOG for v3.4.0 release#289

	on:[push, pull_request]

	name:Continuous integration

	jobs:
	check:
	name:Check
	runs-on:ubuntu-latest
	strategy:
	matrix:
	rust:
	-stable
	-1.70.0
	steps:
	-uses:actions/checkout@v2
	-uses:actions-rs/toolchain@v1
	with:
	profile:minimal
	toolchain:${{ matrix.rust }}
	override:true
	-uses:actions-rs/cargo@v1
	with:
	command:check

	test:
	name:Test Suite
	runs-on:ubuntu-latest
	strategy:
	matrix:
	rust:
	-stable
	-1.70.0
	steps:
	-uses:actions/checkout@v2
	-uses:actions-rs/toolchain@v1
	with:
	profile:minimal
	toolchain:${{ matrix.rust }}
	override:true
	-uses:actions-rs/cargo@v1
	with:
	command:test

	fmt:
	name:Rustfmt
	runs-on:ubuntu-latest
	strategy:
	matrix:
	rust:
	-stable
	-1.70.0
	steps:
	-uses:actions/checkout@v2
	-uses:actions-rs/toolchain@v1
	with:
	profile:minimal
	toolchain:${{ matrix.rust }}
	override:true
	-run:rustup component add rustfmt
	-uses:actions-rs/cargo@v1
	with:
	command:fmt
	args:--all -- --check

	clippy:
	name:Clippy
	runs-on:ubuntu-latest
	strategy:
	matrix:
	rust:
	-stable
	-1.70.0
	steps:
	-uses:actions/checkout@v2
	-uses:actions-rs/toolchain@v1
	with:
	profile:minimal
	toolchain:${{ matrix.rust }}
	override:true
	-run:rustup component add clippy
	-uses:actions-rs/cargo@v1
	with:
	command:clippy
	args:-- -D warnings

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