docs: add changelog for from_fits_image's fixed healpix order calcula…

…tion

CHANGELOG.md

@@ -22,11 +22,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Creation of a single MOC from a lot of small cones is faster with the new option in
 `MOC.from_cones`: the keyword 'union_strategy' can now take the value 'small_cones'.
 * `MOC.from_fits_images` can now loop through the HDUList to only keep images with the
-parameter `hdu_index` set to -1.
+parameter `hdu_index` set to -1 [#110]
+
+### Fixed
+
+* fix healpix order corresponding to 1 pixel on the image calculation in `from_fits_image` [#169]
 
 ## [0.16.2]
 
-## Fixed
+### Fixed
 
 * `MOC.from_astropy_regions` now accepts `EllipseSkyRegion` and `RectangleSkyRegion` where
   width > height.