docs: update CHANGELOG.md for v0.3.9 #20

Job	Run time
Build (x86_64-apple-darwin)	4m 0s
Build (x86_64-unknown-linux-musl)	3m 15s
Build (aarch64-apple-darwin)	3m 31s
Build (aarch64-unknown-linux-gnu)	3m 38s
Build (x86_64-unknown-linux-gnu)	3m 11s
Build (x86_64-pc-windows-msvc)	4m 21s
Upload Assets	13s
Publish to crates.io	2m 30s
	24m 39s

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