### 0.2.1.0
- Ensure that *para_style* is always found (different versions of Pandoc may
render contents of *MetaBlocks* as *Para* or *Plain*).
### 0.2.0.0
- Render substitutions using Pandoc's writers.
- Improved matching algorithms in metadata blocks.
- Implemented a new method of substitution using code blocks in metadata. This
method must be preferred for all output formats.
- Added verbatim placeholders `$$SRC$$` and `$$TITLE$$`, and placeholder
`$$ALT$$` in which all formatting is removed.
### 0.1.1.0
- Added support for Pandoc 2.0.
- Dropped support for GHC older than 7.8 (pattern synonyms are required).