#1477 update changelog

Author: martinjrobins

CHANGELOG.md

@@ -43,6 +43,7 @@
 
 ## Breaking changes
 
+-   Changed sensitivity API. Removed `ProcessedSymbolicVariable`, all sensitivity now handled within the solvers and `ProcessedVariable` ()  ([#1552](https://github.com/pybamm-team/PyBaMM/pull/1552))
 -   The `Yang2017` parameter set has been removed as the complete parameter set is not publicly available in the literature ([#1577](https://github.com/pybamm-team/PyBaMM/pull/1577))
 -   Changed how options are specified for the "loss of active material" and "particle cracking" submodels. "loss of active material" can now be one of "none", "stress-driven", or "reaction-driven", or a 2-tuple for different options in negative and positive electrode. Similarly "particle cracking" (now called "particle mechanics") can now be "none", "swelling only", "swelling and cracking", or a 2-tuple ([#1490](https://github.com/pybamm-team/PyBaMM/pull/1490))
 -   Changed the variable in the full diffusion model from "Electrolyte concentration" to "Porosity times concentration" ([#1476](https://github.com/pybamm-team/PyBaMM/pull/1476))
@@ -185,8 +186,6 @@ This release adds new operators for more complex models, some basic sensitivity
 
 ## Breaking changes
 
--   Changed sensitivity API. Removed `ProcessedSymbolicVariable`, all sensitivity now handled within the solvers and `ProcessedVariable` ()
--  Renamed `quick_plot_vars` to `output_variables` in `Simulation` to be consistent with `QuickPlot`. Passing `quick_plot_vars` to `Simulation.plot()` has been deprecated and `output_variables` should be passed instead ([#1099](https://github.com/pybamm-team/PyBaMM/pull/1099))
 -   The "fast diffusion" particle option has been renamed "uniform profile" ([#1130](https://github.com/pybamm-team/PyBaMM/pull/1130))
 -   The modules containing standard parameters are now classes so they can take options
 (e.g. `standard_parameters_lithium_ion` is now `LithiumIonParameters`) ([#1120](https://github.com/pybamm-team/PyBaMM/pull/1120))