add paper to changelog
@@ -17,6 +17,7 @@ This project adheres to
- This is the version of PyMedPhys reviewed for PyMedPhys' first publication
within the [Journal of Open Source Software (JOSS)](https://joss.theoj.org/).
+ The paper can be accessed [here](https://joss.theoj.org/papers/10.21105/joss.04555)
## [0.39.2]
