Update changelog to mention #1389 fix

CHANGELOG.md

@@ -6,7 +6,8 @@ NOTE: isort follows the [semver](https://semver.org/) versioning standard.
 ### 5.5.0 TBD
   - Fixed #1398: isort: off comment doesn't work, if it's the top comment in the file.
   - Fixed #1395: reverse_relative setting doesn't have any effect when combined with force_sort_within_sections.
-  - Fixed #1399: --skip can error in the case of projects that contain recursive for-loops.
+  - Fixed #1399: --skip can error in the case of projects that contain recursive symlinks.
+  - Fixed #1389: ensure_newline_before_comments doesn't work if comment is at top of section and sections don't have lines between them.
   
 ### 5.4.2 Aug 14, 2020
   - Fixed #1383: Known other does not work anymore with .editorconfig.