### 0.2.5
* Fixed a bug where an exclamation mark "!" followed by a footnote would be
eaten by the parser.
### 0.2.4
* Added footnotes support.
### 0.2.3
* Added header IDs extension.
### 0.2.2
* Fix for pathological reference link parsing.
### 0.2.1
* Speed optimisations.
### 0.2.0
* The formatters no longer produce Strings themeselves; you must specify an
output stream.
* Speed up whitespace normalisation.
### 0.1.9
* Multibyte character fix for autolink (#35, Shaquille Johnson).
* Resolve panics with tables in awkward situations (#36).
### 0.1.8
* Fix possible DoS in link parsing (#33, Demi Obenour).