Log Message:
textproc/hs-commonmark-extensions: update to commonmark-extensions-0.2.6

## 0.2.6

  * Track wikilinks with a class instead of the title (Evan
    Silberman). The use of title="wikilink" in HTML output traces
    back to Pandoc's hijacking of the title attribute for this purpose
    back when Pandoc links didn't have Attrs. A coordinated change in
    Pandoc moves this more appropriately into a class.