chore: add comments about RAR 4.x and 5.0 signature #45

Job	Run time
clippy-checks	55s
rustfmt-nightly-check	12s
build-and-test / build-artifacts-and-run-tests (false, false, false, x86_64-unknown-linux-gnu)	1m 41s
build-and-test / build-artifacts-and-run-tests (false, false, false, x86_64-pc-windows-gnu)	5m 35s
build-and-test / build-artifacts-and-run-tests (false, false, false, x86_64-pc-windows-msvc)	4m 34s
build-and-test / build-artifacts-and-run-tests (false, false, false, aarch64-pc-windows-msvc)	1m 3s
build-and-test / build-artifacts-and-run-tests (false, false, false, x86_64-apple-darwin)	2m 35s
build-and-test / build-artifacts-and-run-tests (false, false, false, x86_64-unknown-linux-musl)	2m 10s
build-and-test / build-artifacts-and-run-tests (false, false, false, aarch64-unknown-linux-gnu)	5m 5s
build-and-test / build-artifacts-and-run-tests (false, false, false, aarch64-unknown-linux-musl)	4m 18s
build-and-test / build-artifacts-and-run-tests (false, false, false, armv7-unknown-linux-gnueabihf)	4m 54s
build-and-test / build-artifacts-and-run-tests (false, false, false, armv7-unknown-linux-musleabihf)	4m 21s
build-and-test / build-artifacts-and-run-tests (true, x86_64-unknown-linux-gnu)	1m 58s
build-and-test / build-artifacts-and-run-tests (true, x86_64-unknown-linux-gnu)	1m 45s
build-and-test / build-artifacts-and-run-tests (true, x86_64-unknown-linux-gnu)	1m 36s
	42m 42s

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