pybamm-team#1330 update CHANGELOG

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Features
 
-
+-   Added functionality to `Citations` to print formatted citations ([#1340](https://github.com/pybamm-team/PyBaMM/pull/1340))
 -   Updated the way events are handled in `CasadiSolver` for more accurate event location ([#1328](https://github.com/pybamm-team/PyBaMM/pull/1328))
 -   Added error message if initial conditions are outside the bounds of a variable ([#1326](https://github.com/pybamm-team/PyBaMM/pull/1326))
 -   Added temperature dependence to density, heat capacity and thermal conductivity ([#1323](https://github.com/pybamm-team/PyBaMM/pull/1323))
@@ -32,6 +32,7 @@
 
 ## Breaking changes
 
+-   All example notebooks in PyBaMM's GitHub repository must now include the command `pybamm.print_citations()`, otherwise the tests will fail. This is to encourage people to use this command to cite the relevant papers ([#1340](https://github.com/pybamm-team/PyBaMM/pull/1340))
 -   `Interpolant` now takes `x` and `y` instead of a single `data` entry ([#1312](https://github.com/pybamm-team/PyBaMM/pull/1312))
 -   Boolean model options ('sei porosity change', 'convection') must now be given in string format ('true' or 'false' instead of True or False) ([#1280](https://github.com/pybamm-team/PyBaMM/pull/1280))
 -   Operations such as `1*x` and `0+x` now directly return `x`. This can be bypassed by explicitly creating the binary operators, e.g. `pybamm.Multiplication(1, x)` ([#1252](https://github.com/pybamm-team/PyBaMM/pull/1252))