chore: release v0.3.1 (#29)

## 🤖 New release
* `tket-json-rs`: 0.3.0 -> 0.3.1 (✓ API compatible changes)

<details><summary><i><b>Changelog</b></i></summary><p>

<blockquote>

## 0.3.1 (2024-02-26)

### Features

- ToffoliBox encoding
([#28](#28))
</blockquote>


</p></details>

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CHANGELOG.md

@@ -1,5 +1,11 @@
 # Release notes
 
+## 0.3.1 (2024-02-26)
+
+### Features
+
+- ToffoliBox encoding ([#28](https://github.com/CQCL/tket-json-rs/pull/28))
+
 ## 0.3.0 (2023-11-09)
 
 ### Features

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tket-json-rs"
-version = "0.3.0"
+version = "0.3.1"
 license = "Apache-2.0"
 edition = "2021"
 rust-version = "1.70"