Add changelog entry for switching to UTF-16 sting API on Windows #454

Job	Run time
cargo-deny (advisories)	20s
lint	27s
cargo-deny (bans licenses sources)	16s
aarch64-apple-ios / build	21s
aarch64-apple-darwin / build	21s
aarch64-apple-darwin-nightly / build	50s
aarch64-unknown-linux-gnu / build	46s
aarch64-unknown-linux-musl / build	56s
arm-linux-androideabi / build	26s
armv7-linux-androideabi / build	24s
i686-pc-windows-gnu / build	1m 29s
i686-pc-windows-msvc / build	2m 0s
i686-unknown-linux-gnu / build	41s
i686-unknown-linux-musl / build	1m 2s
msrv-x86_64-pc-windows-msvc / build	51s
msrv-aarch64-apple-darwin / build	48s
msrv-x86_64-unknown-freebsd / build	38s
msrv-arm-linux-androideabi / build	34s
msrv-x86_64-unknown-linux-gnu / build	51s
msrv-x86_64-unknown-linux-musl / build	52s
msrv-x86_64-unknown-netbsd / build	38s
x86_64-apple-darwin / build	43s
x86_64-pc-windows-msvc / build	3m 19s
x86_64-pc-windows-gnu / build	1m 31s
x86_64-pc-windows-msvc-nightly / build	2m 5s
x86_64-unknown-freebsd / build	26s
x86_64-unknown-linux-gnu / build	58s
x86_64-unknown-linux-gnu-nightly / build	1m 1s
x86_64-unknown-linux-musl / build	53s
x86_64-unknown-netbsd / build	22s
	26m 49s

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