chore: release

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

hugr/CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.3.1 (2024-04-16)
+
+### Features
+
+- 'Replace' rewrite returns node map ([#929](https://github.com/CQCL/hugr/pull/929))
+- `new` methods for leaf ops ([#940](https://github.com/CQCL/hugr/pull/940))
+
+### Testing
+
+- Add a test of instantiating an extension set ([#939](https://github.com/CQCL/hugr/pull/939))
+
+
 ## 0.3.0 (2024-04-15)
 
 ### Main changes

hugr/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "hugr"
-version = "0.3.0"
+version = "0.3.1"
 edition = { workspace = true }
 rust-version = { workspace = true }