Fix `CHANGELOG.md` format #97

Job	Run time
cargo check (aarch64-android)	1m 37s
cargo check (msrv) (wasm32)	1m 0s
cargo test (wasm32)	1m 2s
cargo check (msrv) (windows-latest)	3m 19s
cargo doc	1m 13s
cargo check (msrv) (macos-latest)	1m 32s
cargo fmt	19s
cargo clippy + test (windows-latest)	5m 26s
cargo check (msrv) (ubuntu-latest)	57s
cargo clippy + test (macos-latest)	3m 12s
typos	5s
cargo clippy + test (ubuntu-latest)	3m 47s
	23m 29s

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