ghc-haddock-library from home:frispete:haskell project

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For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frispete:haskell/openSUSE_Leap_15.0/home:frispete:haskell.repo
zypper refresh
zypper install ghc-haddock-library