Add clippy warnings and update some metadata #106

Job	Run time
Run examples using Rust stable (ubuntu-latest)	16s
Verify code formatting (windows-latest)	46s
Lint with clippy (windows-latest, --all-features)	1m 22s
Verify code formatting (ubuntu-latest)	3s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --all-features)	59s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --no-default-features)	1m 58s
Lint with clippy (windows-latest, --no-default-features)	27s
Test Rust stable (macos-latest, --all-features)	32s
Lint with clippy (ubuntu-latest, --all-features)	10s
Test Rust stable (macos-latest, --no-default-features)	24s
Lint with clippy (ubuntu-latest, --no-default-features)	8s
Test Rust stable (ubuntu-latest, --all-features)	29s
Test Rust stable (ubuntu-latest, --no-default-features)	29s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --all-features)	6s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --no-default-features)	10s
Test Rust 1.58.1 (ubuntu-latest, --all-features)	35s
Test Rust 1.58.1 (ubuntu-latest, --no-default-features)	34s
	9m 28s

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