Update nuget packages

[kodfodrasz]

The packages available on nuget are more than 2 years old. (Version 1.5 from 2012.)

They contains bugs fixed since a long time, for example the handling of bactick code blocks.

Please publish fresher builds!

[kbilsted]

:+1:

[madskristensen]

:+1:

[sayedihashimi]

+1

[bradygaster-zz]

+1

[lmh9974a]

+1

[sandrock]

+1