pybamm-team#1173 edit CHANGELOG

Author: brosaplanella

CHANGELOG.md

@@ -9,6 +9,7 @@
 ## Bug fixes
 
 -   Raise error if the boundary condition at the origin in a spherical domain is other than no-flux ([#1175](https://github.com/pybamm-team/PyBaMM/pull/1175))
+-   Fix boundary conditions at r = 0 for Creating Models notebooks ([#1173](https://github.com/pybamm-team/PyBaMM/pull/1173))
 
 ## Breaking changes