Merge pull request #78 from paramm-team/develop

Update CHANGELOG.md

Author: brosaplanella

CHANGELOG.md

@@ -1,5 +1,6 @@
 # [Unreleased](https://github.com/paramm-team/pybamm-param/)
 
+# [v0.1](https://github.com/paramm-team/pybamm-param/tree/v0.1)
 ## Features
 
 ### Optimisation problems
@@ -34,4 +35,4 @@
 - Set up hatch ([#11](https://github.com/paramm-team/pybamm-param/pull/11))
 - Reformat optimisation problem ([#9](https://github.com/paramm-team/pybamm-param/pull/0))
 - Setup documentation infrastructure ([#8](https://github.com/paramm-team/pybamm-param/pull/8))
-- Define package structure ([#2](https://github.com/paramm-team/pybamm-param/pull/2))
+- Define package structure ([#2](https://github.com/paramm-team/pybamm-param/pull/2))