CHANGELOG.markdown in image_optim-0.26.2 vs CHANGELOG.markdown in image_optim-0.26.3

@@ -1,8 +1,12 @@
 # ChangeLog
 
 ## unreleased
 
+## v0.26.3 (2018-10-13)
+
+* Handle `vnone` version of `advpng` that was erroneously produced for `ubuntu` and `homebrew` [#165](https://github.com/toy/image_optim/issues/165) [@toy](https://github.com/toy)
+
 ## v0.26.2 (2018-08-15)
 
 * Ignore segmentation fault for `pngout` <= `20150920` [#158](https://github.com/toy/image_optim/issues/158) [@toy](https://github.com/toy)
 * Allow `image_size` 2.x [@toy](https://github.com/toy)
 * Add instructions for installing `svgo` in project folder [#156](https://github.com/toy/image_optim/issues/156) [@brian-kephart](https://github.com/brian-kephart)