abstract-section v1.2.0

Released 2023-04-27.

• The requirement for abstracts to always be at level 1 has been
  relaxed: it is now enough if there is no higher level heading in the document
  before the abstract. This makes it easier to use
  the filter with shifted heading levels.

abstrat-section v1.1.0

• Added support for multiple abstract-like sections; useful when providing abstracts in multiple languages.