Pandoc-fignos

* Require pandoc-xnos>=1.1,<2 to ensure API compatibility
(Issue 46).
* Gives more helpful error message regarding acceptable
boolean metadata values (Issue 51).
* Removed blank line before caption in docx output
(pandoc-tablenos Issue 6).

* Added `fignos-capitalise` meta variable (pull request 44).

* Update for compatibility with pandoc-xnos 0.15.

* Version number bumped to 1.0.0.
* Put span around html caption label (e.g., "Fig. 1") to
allow styling.

* Fixed a corner case attributes processing bug (Issue 41).
* Removed dependency on pandoc-attributes
(pandoc-fignos Issue 42).

* Release candidate updated for pandoc 2.0.