changelog: note change about serial ports on windows #291

Job	Run time
cargo-deny (advisories)	20s
lint	1m 8s
cargo-deny (bans licenses sources)	17s
aarch64-apple-darwin / build	1m 22s
aarch64-apple-ios / build	1m 18s
aarch64-unknown-linux-gnu / build	47s
aarch64-unknown-linux-musl / build	1m 8s
arm-linux-androideabi / build	30s
armv7-linux-androideabi / build	38s
i686-pc-windows-gnu / build	2m 5s
i686-pc-windows-msvc / build	4m 59s
i686-unknown-linux-gnu / build	36s
i686-unknown-linux-musl / build	1m 23s
msrv / build	4m 37s
x86_64-apple-darwin / build	1m 25s
x86_64-pc-windows-gnu / build	5m 35s
x86_64-pc-windows-msvc / build	4m 36s
x86_64-unknown-freebsd / build	36s
x86_64-unknown-linux-gnu / build	1m 7s
x86_64-unknown-linux-musl / build	1m 30s
x86_64-unknown-netbsd / build	25s
	36m 22s

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