DOC: changelog

CHANGELOG.md

 # `fsl_add_module` changelog
 
 
+## 0.4.0 (Tuesday 24th January 2023)
+
+ - Changed the default behaviour so that only files in the `fsl_course_data`
+   category are downloaded. This can be overridden by specifying `--category
+   all`.
+ - Prefix downloaded files with their category name to reduce the likelihood
+   of collisions across different categories (e.g. `registration.tar.gz` from
+   the FSL course and from grad course data sets). Nothing is done to prevent
+   collisions in extracted paths from different archives though.
+ - The `--force` option can now be used without specifying any modules - it
+   causes all modules in the default/selected cateogories to be downloaded.
+
+
 ## 0.3.2 (Wednesday 1st September 2021)
 
  - Changed the default manifest URL to