[0.17]

  * Stripped out all JavaScript related code and documentation, moving
    it to a separate repository (<https://github.com/jgm/commonmark.js>).
  * Improved Makefile targets, so that `cmake` is run again only when
    necessary (Nick Wellnhofer).
  * Added `INSTALL_PREFIX` to the Makefile, allowing installation to a
    location other than `/usr/local` without invoking `cmake`
    manually (Nick Wellnhofer).
  * `make test` now guarantees that the project will
    be rebuilt before tests are run (Nick Wellnhofer).
  * Prohibited overriding of some Makefile variables (Nick Wellnhofer).
  * Provide version number and string, both as macros
    (`CMARK_VERSION`, `CMARK_VERSION_STRING`) and as symbols
    (`cmark_version`, `cmark_version_string`) (Nick Wellnhofer).  All of
    these come from `cmark_version.h`, which is constructed from a
    template `cmark_version.h.in` and data in `CMakeLists.txt`.
  * Avoid calling `free` on null pointer.
  * Added an accessor for an iterator's root node (`cmark_iter_get_root`).
  * Added user data field for nodes (Nick Wellnhofer).  This is
    intended mainly for use in bindings for dynamic languages, where
    it could store a pointer to a target language object (#287).  But
    it can be used for anything.
  * Man renderer:  properly escape multiline strings.
  * Added assertion to raise error if finalize is called on a closed block.
  * Implemented the new spec rule for emphasis and strong emphasis with `_`.
  * Moved the check for fence-close with the other checks for end-of-block.
  * Fixed a bug with loose list detection with items containings
    fenced code blocks (#285).
  * Removed recursive algorithm in `ends_with_blank_line` (#286).
  * Minor code reformatting: renamed parameters.

[0.16]

  * Added xml renderer (XML representation of the CommonMark AST,
    which is described in `CommonMark.dtd`).
  * Reduced size of gperf entity table (Nick Wellnhofer).
  * Reworked iterators to allow deletion of nodes during iteration
    (Nick Wellnhofer).
  * Optimized `S_is_leaf`.
  * Added `cmark_iter_reset` to iterator API.
  * Added `cmark_consolidate_text_nodes` to API to combine adjacent
    text nodes.
  * Added `CMARK_OPT_NORMALIZE` to options (this combines adjacent
    text nodes).
  * Added `--normalize` option to command-line program.
  * Improved regex for HTML comments in inline parsing.
  * Python is no longer required for a basic build from the
    repository.