Update itertools requirement from 0.12.1 to 0.13.0 #589

	name: Continuous integration

	on: [ push ]

	env:
	CARGO_TERM_COLOR: always

	jobs:
	test:
	name: Test Suite
	runs-on: ubuntu-latest
	services:
	cassandra:
	image: cassandra
	ports:
	- 9042:9042
	steps:
	- uses: actions/checkout@v2
	- name: Install minimal toolchain with clippy and rustfmt
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable
	components: rustfmt, clippy
	- name: Run tests
	# test threads must be one because else database tests will run in parallel and will result in flaky tests
	run: cargo test --all-features --verbose -- --test-threads=1
	- name: Format check
	run: cargo fmt --all -- --check
	# Ensure that all targets compile and pass clippy checks under every possible combination of features
	- name: Clippy check
	run: cargo install cargo-hack && cargo hack --feature-powerset clippy --locked --release

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