Update to support pandoc 2.10.x#17

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andrebauer wants to merge 4 commits intosteindani:masterfrom

andrebauer:master

Commits on Apr 14, 2018

do some stuff to keep other attributes and only skip include
Herbert Lange
committed

Commits on May 22, 2020

fix the module to match modern pandoc
Herbert Lange
committed

Commits on Oct 4, 2020