Add changelog

Back ported the changelog from the trunk, and added an entry for the
port to dune

CHANGES.md

@@ -0,0 +1,117 @@
+# Document Title
+
+1.3.2
+------
+
+- port from oasis to dune (#273, @tmattio)
+
+1.3.x
+-----
+
+- might stop checking validity of HTML tag *names* and accept any XML-parsable
+  tag name.
+
+1.2.5
+-----
+
+- only fixes a single bug (an ordered list could be transformed into an
+  unordered list)
+
+1.2.4
+-----
+
+- only fixes a single bug (some spaces were wrongly handled in the HTML parsing)
+
+1.2.2/3
+-------
+
+- fix a few issues with HTML parsing.
+
+1.2.1
+-----
+
+- mainly fixes issues with HTML parsing.
+
+1.2.0
+-----
+
+- introduces options `-w` and `-W`. Fixes mostly concern subtle uses of `\n`s in
+  HTML and Markdown outputs.
+
+1.1.2
+-----
+
+- fix: some URL-related parsing issues.
+
+1.1.0/1.1.1
+-----------
+
+- fix: some HTML-related issues.
+
+1.0.1
+-----
+
+- fixes some parsing issues, improves output. (2014-10-02)
+
+1.0.0
+-----
+
+- warning: this release is only partially compatible with previous versions.
+
+- accept HTML blocks which directly follow each other
+
+- fix: accept all XML-compatible attribute names for HTML
+  attributes
+
+- fix backslash-escaping for hash-ending ATX-titles + fix Markdown output for
+  Html_block
+
+- fix (HTML parsing) bugs introduced in 1.0.0.b and 1.0.0.c
+
+- rewrite parser of block HTML to use the updated Omd.t
+
+- rewrite parser of inline HTML to use the updated Omd.t
+
+- upgrade Omd.t for HTML representation
+
+There will not be any newer 0.9.x release although new bugs have been
+discovered. Thus it's recommended to upgrade to the latest 1.x.y.
+
+0.9.7
+-----
+
+- introduction of media:end + bug fixes.
+
+If you need to have a version that still has `Tag of extension` instead of `Tag
+of name * extension` and don't want to upgrade, you may use 0.9.3
+
+0.9.6
+-----
+
+- fix a bug (concerning extensions) introduced by 0.9.4.
+
+0.9.5
+-----
+
+- bug fix + `Tag of extension` changed to `Tag of name * extension`
+
+0.9.4
+-----
+
+- fixes a bug for the new feature
+
+0.9.3
+-----
+
+- new feature `media:type="text/omd"`. This version is recommended if you do
+  not use that new feature and want to use 0.9.x
+
+0.9.2
+-----
+
+- not released...
+
+older versions
+--------------
+
+- cf. [commit log](https://github.com/ocaml/omd/commits/master)