Update changelog

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## [3.x - Unreleased] - 2021-xx-xx
 
+## [3.9.1] - 2021-05-05
+### Fixed
+- Fixed issue where available width for an item could be miscalculated at the far end of a box
+### Changed
+- Improved efficiency in packing
+
 ## [3.9.0] - 2021-03-14
 ### Added
 - Added ``packAcrossWidthOnly()`` to ``VolumePacker`` for scenarios where the container will be side-loaded rather
@@ -458,8 +464,9 @@ Initial release
  - Experimental code to get a feel for how calculations can best be implemented
  - Only works if all items fit into a single box (so not production ready at all)
 
-[3.x - Unreleased]: https://github.com/dvdoug/BoxPacker/compare/3.9.0...3.x
+[3.x - Unreleased]: https://github.com/dvdoug/BoxPacker/compare/3.9.1...3.x
 
+[3.9.1]: https://github.com/dvdoug/BoxPacker/compare/3.9.0...3.9.1
 [3.9.0]: https://github.com/dvdoug/BoxPacker/compare/3.8.0...3.9.0
 [3.8.0]: https://github.com/dvdoug/BoxPacker/compare/3.7.0...3.8.0
 [3.7.0]: https://github.com/dvdoug/BoxPacker/compare/3.6.2...3.7.0