Log Message:
Update to commonmark-pandoc-0.2.1.2

0.2.1.2
* Fix addition of sourcepos attributes to blocks (jgm/pandoc#7769). We were
  always adding an enclosing Div, even when the block admits
  attributes. Now the attributes are added to the block itself, unless it
  can't accept attributes (as with inlines).

0.2.1.1
* Don't collapse Para to Plain in task lists (#77).

0.2.1
* commonmark-pandoc.cabal: remove unneeded build-depend on containers.
* Support wikilinks extension.