Package takeover request for rapid

[Markus Läll]

Hi

I would like to take over https://hackage.haskell.org/package/rapid

The author of the package Ertugrul Söylemez, once an active member of
the community perhaps best known for netwire, passed away in 2018. [1]
The work required for the package thus far, and for which I've kept a
fork for, is to bump version bounds as GHCs progress.

[1] https://github.com/esoeylemez/rapid/pull/2#issuecomment-427065739

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Markus Läll