Update changelog for version bump

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## 0.3.1 (2023-02-15)
+
 ### Changed
 - `lilio.resample` will now return `xr.DataArray` if the input is `xr.DataArray`.
 - For compatibility with DataArray output, the Dataset/DataArray returned by resample now has the coordinates "left_bound" and "right_bound" instead of a single "intervals" coordinate with the "bounds" dimension.
@@ -14,7 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 - In the output of `resample()`, the column/coordinate `target` has been renamed to `is_target` to avoid clashing with a possibly commonly used name by users.
 - The input data into `resample()` is now checked for the existance of reserved names, such as "anchor_year" or "i_interval", to avoid overwriting these and cause unpredictable behavior.
 
-## 0.3.0 (2022-02-08)
+## 0.3.0 (2023-02-08)
 
 First release of Lilio as a split off from `s2spy`.