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start 0.18 changelog #951

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24 changes: 24 additions & 0 deletions CHANGELOG.md
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# 0.18.0 (in progress)

## Behavioural changes

### Cats Module

Addition of a cats module to contain `SchemaVisitor` implementations of commonly-used cats typeclasses. Currently included are `cats.Show` and `cats.Hash` (note that `cats.Eq` is provided by the `cats.Hash` implementation).

See https://github.com/disneystreaming/smithy4s/pull/921

### Structure Patterns

Allows for marking string types with the `alloy#structurePattern` trait. This trait indicates that a given pattern, with parameters, applies to a given string and that this string should
actually be parsed into a structure where the members of the structure are derived from the parameters in the string pattern.

See https://github.com/disneystreaming/smithy4s/pull/942

### Non-Orphan Typeclass Instances

Allows creating implicit typeclass instances in the companion objects in the smithy4s-generated code. This is useful for creating instances of
typeclasses such as `cats.Show`, `cats.Eq` or any others you may be using.

See https://github.com/disneystreaming/smithy4s/pull/912

# 0.17.5

This release is backward binary-compatible with the previous releases from the 0.17.x lineage.
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