add to changelog

CHANGELOG.md

@@ -13,14 +13,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   Added support for saving and loading of `ESMFAreaWeighted`, `ESMFBilinear`
   and `ESMFNearest` regridders.
   [@stephenworsley](https://github.com/stephenworsley)
+- [PR#319](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/319)
+  Added `CITATION.cff`.
+  [@bjlittle](https://github.com/bjlittle)
 
 ### Changed
 
 - [PR#361](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/361)
   Moved the code for running benchmarks to `bm_runner.py` in line with iris
   benchmarks.
   [@stephenworsley](https://github.com/stephenworsley)
-
 - [PR#293](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/293)
   Enumerated method and normtype input.
   [@ESadek-MO](https://github.com/ESadek-MO)
@@ -30,11 +32,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - [PR#239](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/239)
   Ensured dtype is preserved by regridding.
   [@stephenworsley](https://github.com/stephenworsley)
-
 - [PR#353](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/353)
   Fixed a bug which caused errors with ESMF versions 8.6 and higher.
   [@stephenworsley](https://github.com/stephenworsley)
-
 - [PR#338](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/338)
   Fixed a potential memory leak when creating regridders.
   [@stephenworsley](https://github.com/stephenworsley)