trim CHANGELOG.md to python only changes

hugr-py/CHANGELOG.md

@@ -5,17 +5,15 @@
 
 ### ⚠ BREAKING CHANGES
 
-* Moved `itobool`/`ifrombool`/`itostring_{u,s}` to the conversions extension.
 * Binary sums representing fallible values now use tag `1` for the successful variant
 * rename `Custom.name` to `Custom.op_name` and `Func(Defn/Decl).name` to `f_name` to allow for new `name` method
 * `ListOp::pop` now returns an option.
 * Moved all builder definitions into the `hugr.build` module. Moved `node_port` and `render` into the `hugr.hugr` module.
-* Move `Lift`, `MakeTuple`, `UnpackTuple` and `Lift` from core operations to prelude. Rename `ops::leaf` module to `ops::sum`.
+* Move `Lift`, `MakeTuple`, `UnpackTuple` and `Lift` from core operations to prelude.
 * `hugr.serialization` module and `to_serial` methods are now internal only.
 * Renamed `_DfBase` to `DfBase` and `_DefinitionBuilder` to `DefinitionBuilder`
 * `idivmod_checked`, `idivmod`, `idiv`, `idiv_checked`, `imod`, `ishl`, `ishr`, `irotl`, `irotr` operations now only have one width argument for all inputs and outputs rather than two.
 * HUGRs containing opaque operations that don't point to an extension in the registry will fail to validate. Use `Package` to pack extensions with HUGRs for serialisation.
-* `CustomOp` removed, `OpType` now contains `ExtensionOp` and `OpaqueOp` directly. `CustomOpError` renamed to`OpaqueOpError`.
 
 ### Features
 
@@ -41,7 +39,6 @@
 
 ### Code Refactoring
 
-* flatten `CustomOp` in to `OpType` ([#1429](https://github.com/CQCL/hugr/issues/1429)) ([8e8bba5](https://github.com/CQCL/hugr/commit/8e8bba55a5d2a0a421a835b80c8aea07eae28e65))
 * make serialization (module/methods) private ([#1477](https://github.com/CQCL/hugr/issues/1477)) ([49a5bad](https://github.com/CQCL/hugr/commit/49a5bad5399eef248aba0b74b14ac23546324b14))
 * Make `_DfBase` and `_DefinitionBuilder` public ([#1461](https://github.com/CQCL/hugr/issues/1461)) ([ea9cca0](https://github.com/CQCL/hugr/commit/ea9cca001bff3fff41d84e861f8b2b7ee26645d1))
 * Make Either::Right the "success" case ([#1489](https://github.com/CQCL/hugr/issues/1489)) ([8caa572](https://github.com/CQCL/hugr/commit/8caa572d01aac59715480827eaf568d8488ff542))