Add CHANGELOG

Resolves #18.

CHANGELOG.md

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+# v2.4.3
+
+* Bug fixes ([#15](https://github.com/middleman/middleman-autoprefixer/issues/15)).
+
+# v2.4.2
+
+* Added support for stylesheets served behind defined proxy paths ([#13](https://github.com/middleman/middleman-autoprefixer/issues/13)).
+
+# v2.4.1
+
+* Updated Autoprefixer.
+
+# v2.4.0
+
+* Updated Autoprefixer to 5.0.
+
+# v2.3.0
+
+* Updated Autoprefixer to 4.0.
+
+# v2.2.2
+
+* Bug fixes ([#11](https://github.com/middleman/middleman-autoprefixer/issues/11), [#12](https://github.com/middleman/middleman-autoprefixer/issues/12)).
+
+# v2.2.1
+
+* Updated Autoprefixer.
+
+# v2.2.0
+
+* Updated Autoprefixer to 3.0.
+
+# v2.1.2
+
+* Bug fixes ([#9](https://github.com/middleman/middleman-autoprefixer/issues/9)).
+* If you’re still experiencing random `500` errors when serving stylesheets, make sure you’re using `middleman-sprockets` in version `>= 3.3.9`.
+
+# v2.1.1
+
+* Updated Autoprefixer.
+
+# v2.1.0
+
+* Added two new options: `inline` and `ignore`.
+
+# v2.0.1
+
+* Updated Autoprefixer.
+
+# v2.0.0
+
+* The extension is now based on [Autoprefixer 2](https://github.com/ai/autoprefixer/releases/tag/2.0.0) and has been rewritten in the format that’s also compatible with both Middleman 3 and the upcoming version 4 ([#6](https://github.com/middleman/middleman-autoprefixer/issues/6)).
+
+# v1.1.3
+
+* Updated Autoprefixer to the most recent stable version.
+
+# v1.1.2
+
+* Cut down on dependencies ([#5](https://github.com/middleman/middleman-autoprefixer/issues/5)).
+
+# v1.1.1
+
+* Fixed the bug where the gem could not be installed with newer Middleman versions.
+
+# v1.1.0
+
+* Added visual `cascade` option. See [Autoprefixer’s documentation](https://github.com/ai/autoprefixer#visual-cascade).
+
+# v1.0.1
+
+* Bug fixes.
+
+# v1.0.0
+
+* Middleman Autoprefixer has now a test suite and supports up-to-date Autoprefixer versions.
+
+# v0.2.2
+
+* Fixed the auto-discovery issue ([#1](https://github.com/middleman/middleman-autoprefixer/issues/1), [middleman/middleman#1059](https://github.com/middleman/middleman/issues/1059)).
+
+# v0.2.1
+
+* Added a post-install message that warns about the changed default `browsers` option in Autoprefixer.
+
+# v0.2
+
+* Added `browsers` option. See [Autoprefixer’s documentation](https://github.com/ai/autoprefixer#browsers).
+
+# v0.1
+
+* The initial version of the extension.