Log Message:
textproc/hs-citeproc: Update to 0.8.1

0.8.1
* In Pandoc and CslJson CaseTransform, group punctuation in clusters
  (#127).
* Fix sorting on dates (#126). Previously this broke for some styles,
  e.g. apa.csl, which styles dates as MM/DD/YYYY, and would lead to
  incorrect sorting of dates with months and/or days.
* Add citation-key variable from citeId. This is a new addition in CSL
  1.0.2.
* Update locales from upstream.
* Raise an error if multiple layout elements are present (#120).
* Fix two test cases. They had illegal bibliography elements with no layout
  children.
* If there are multiple layout elements, only use the last one. This can
  happen with CSL-M styles. The last layout should be
  locale-unspecific. This change will prevent us from emitting doubled
  citations or bibliographic references (see #120), allowing more graceful
  handling of CSL-M styles, even though we don't support CSL-M.

0.8.0.2
* Fix missing locator after collapsing and grouping with year suffix (#96).

0.8.0.1
* Fix disambiguation edge case (#116). We weren't properly disambiguating
  when only one of two ambiguous names had a subsequent citation.
* Chicago page numbering fixes.
* Update test suite form upstream.
* Handle whole-citation links differently in secondFieldAlign (#113,
  Benjamin Bray).
* Require data-default >= 0.5.2 (#114, Bodigrim).

0.8
* Add SubstitutedVal constructor for Val [API change] (#101, #108). This is
  used to track variables that are repressed due to substitution. (We can't
  just delete them, because they still count when we have "if" elements
  that check for a variable.)
* Fix logic for including a group. A group with a text node and an empty
  variable should count as empty.
* CaseTransform: don't change words that are a mix of uppercase and
  nonletters, like CRT1000.
* Fix label with "page" variable (#107).
* Fix error in test suite. We stripped indentation in the expected result
  in some cases.
* Update fr-FR locale from upstream.

0.7
* Handle old term form sub verbo as if it is sub-verbo (the new form).
* Update to latest locales in CSL repository.
* Makefile: Fix update-locales target.
* Keep explicit "et al." (#102, Albert Krewinkel).
* Factor out deleteSubstitutedVariables.
* Add any references in citationItemData to references.
* Add citationItemData field to CitationItem [API change]. This corresponds
  to the itemData that can appear in the JSON representation of a citation
  item.
* Add Ord, Eq instances for Reference, DisambiguationData, Val [API
  change].