Partially fixed ghc-pkg output parsing for GHC 8.8
Partially fixed ghc-pkg output parsing for GHC 8.8

ghc-pkg output format changes across GHC versions. hoogle generate was
broken for GHC 8.8.3 because it wrongly parsed the package name and
'haddock-html:'.

ndmitchell/hoogle,ndmitchell/hoogle,ndmitchell/hoogle