0.5.1

• Fix bug with shortcodes that have matching prefixes.

0.5.0

• Revert the switch to ShortcodeInline/ShortcodeBlock because it's much easier if the callbacks don't have to know what sort
  of node they're receiving. This release restores the previous behaviour of just providing a Shortcode object to both block and inline
  nodes.

0.4.0

• Split Shortcode into ShortcodeInline and ShortcodeBlock, and require the relevant one to be used in the shortcode callback.
• Improve documentation in README.md.

0.3.1

• Allow trailing spaces after the closing braces of a one-line block shortcode.

0.3.0

• Switch to pipe-separated attributes. The HTML-style is too limiting in what's allowed in attribute names, and makes unnamed attributes too messy.

0.2.1

• Fix parsing of inline shortcodes.

0.2.0

• Allow block shortcodes to terminate on the same line, e.g. {{{pagebreak p=7}}} (with or without attributes).

0.1.0

• First release.