add changelog.

Author: ikirudennis

CHANGELOG.textile

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+h1. Textile Changelog
+
+h1. Version 2.2.1
+
+* drop textilefactory support for html.
+* Various development-related bugfixes.
+* Added this changelog.
+
+h1. Version 2.2.0
+
+* Started refactoring the code to be less repetitive.  @textile.Textile().parse()@ is a little more friendly than @textile.Textile().textile()@  There may be more work to be done on this front to make the flow a little smoother.
+* We now support versions 2.6 - 3.4 (including 3.2) using the same codebase.  Many thanks to Radek Czajka for this.
+* Drop support for html4.  We now only output xhtml or html5.
+* Various development-related bugfixes.
+
+h1. Version 2.1.8
+
+* Add support for html5 output.
+* Lots of new functionality added bringing us in line with the official Textile 2.4