Update CHANGELOG for version 3.8.1

Update CHANGELOG for v3.8.0 release and add missing version links

Make merge function perform deep merge by default (#133)

Recursively merge nested maps key-by-key instead of overwriting.
Slices and scalars still use last-value-wins semantics. The spread
operator ({$a..., $b...}) remains available for shallow merge.

Update CHANGELOG for v3.5.0 release

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Update CHANGELOG for 3.4.1 release

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Fix yaml unbounded expansion (#531)

* Add safeguards to protect against unbound yaml expansion

* Update changelog

Update changelog for v3.3.1 release

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