CHANGELOG.markdown in image_optim-0.20.2 vs CHANGELOG.markdown in image_optim-0.21.0

@@ -1,8 +1,19 @@
 # ChangeLog
 
 ## unreleased
 
+## v0.21.0 (2015-05-30)
+
+* Use exifr 1.2.2 with fix for a bug [#85](https://github.com/toy/image_optim/issues/85) [@toy](https://github.com/toy)
+* Change order of png workers according to analysis to pngcrush, optipng, pngquant, pngout, advpng (was pngquant, pngcrush, pngout, advpng, optipng) [@toy](https://github.com/toy)
+* Run worker command without invoking shell (except ruby < 1.9 and jruby) [@toy](https://github.com/toy)
+* Add disabling worker by passing `:disable => true` (previously only by passing `false` instead of options hash) [@toy](https://github.com/toy)
+* Add tests for railtie, also to prevent [issues like #72](https://github.com/toy/image_optim/issues/72) [#73](https://github.com/toy/image_optim/issues/73) [@toy](https://github.com/toy)
+* Remove haml development dependency [@toy](https://github.com/toy)
+* Add `-strip` option to optipng worker to remove all metadata chunks, on by default [#75](https://github.com/toy/image_optim/issues/75) [@jwidderich](https://github.com/jwidderich)
+* Fixing minor spelling mistakes from `--help` output [#79](https://github.com/toy/image_optim/issues/79) [@kaspergrubbe](https://github.com/kaspergrubbe)
+
 ## v0.20.2 (2014-12-26)
 
 * Fix `ImagePath#temp_path` for ruby 2.2 caused by `Tmpname#make_tmpname` accepting only objects directly convertible to String for prefix and suffix starting with 2.2 [#74](https://github.com/toy/image_optim/issues/74) [@toy](https://github.com/toy)
 
 ## v0.20.1 (2014-12-19)