Better cooperation with Skylighting

[Christoph Cullmann]

Hi,

I contacted the author of Skylighting https://github.com/jgm/skylighting 
to improve our cooperation.

As first step, I imported all highlightings we lacked from their 
repository.

In the future they will hint better to submit stuff to us, too.

See

https://github.com/jgm/skylighting/issues/106

I proposed that we make people aware of their project, too.

Greetings
Christoph

-- 
Ignorance is bliss...
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