update changelog

CHANGELOG.md

@@ -1,4 +1,10 @@
 # [Unreleased](https://github.com/pybamm-team/PyBaMM/)
+## Features
+
+-   Added `__eq__` and `__hash__` methods for `Symbol` objects, using `.id` ([#1978](https://github.com/pybamm-team/PyBaMM/pull/1978))
+## Breaking changes
+
+-   Changed some dictionary keys to `Symbol` instead of `Symbol.id` (internal change only, should not affect external facing functions) ([#1978](https://github.com/pybamm-team/PyBaMM/pull/1978))
 
 # [v22.5](https://github.com/pybamm-team/PyBaMM/tree/v22.5) - 2022-05-31
 
@@ -29,7 +35,6 @@
 
 ## Features
 
--   Added `__eq__` and `__hash__` methods for `Symbol` objects, using `.id` ([#1978](https://github.com/pybamm-team/PyBaMM/pull/1978))
 -   Added "Discharge energy [W.h]", which is the integral of the power in Watts, as an optional output. Set the option "calculate discharge energy" to "true" to get this output ("false" by default, since it can slow down some of the simple models) ([#1969](https://github.com/pybamm-team/PyBaMM/pull/1969)))
 -   Added an option "calculate heat source for isothermal models" to choose whether or not the heat generation terms are computed when running models with the option `thermal="isothermal"`  ([#1958](https://github.com/pybamm-team/PyBaMM/pull/1958))
 
@@ -45,7 +50,6 @@
 
 ## Breaking changes
 
--   Changed some dictionary keys to `Symbol` instead of `Symbol.id` (internal change only, should not affect external facing functions) ([#1978](https://github.com/pybamm-team/PyBaMM/pull/1978))
 -   Removed `model.new_empty_copy()` (use `model.new_copy()` instead) ([#1977](https://github.com/pybamm-team/PyBaMM/pull/1977))
 -   Dropped support for Windows 32-bit architecture ([#1964](https://github.com/pybamm-team/PyBaMM/pull/1964))