CHANGELOG.markdown in image_optim-0.31.0 vs CHANGELOG.markdown in image_optim-0.31.1

- old
+ new

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 # ChangeLog
 
 ## unreleased
 
+## v0.31.1 (2021-10-21)
+
+* Allow image_size 3 [@toy](https://github.com/toy)
+
 ## v0.31.0 (2021-10-03)
 
 * Add support for Oxipng [#167](https://github.com/toy/image_optim/issues/167) [#190](https://github.com/toy/image_optim/pull/190) [@oblakeerickson](https://github.com/oblakeerickson)
 * Fix `TypeError: can't convert ImageOptim::Timer into Float` with Ruby 3 [#194](https://github.com/toy/image_optim/pull/194) [@yahonda](https://github.com/yahonda)
 