TH changes for ghc 8.0

[Erik de Castro Lopo]

Christiaan Baaij wrote:

> mapM conT :: [Name] -> Q [Type] :: [Name] -> Q [Pred] :: [Name] -> CxtQ
> 
> Those `Name`s are Class names, which are Type constructors, hence `conT`

Thanks Christiaan, thats got it for me. I'll update the migration guide
as well.

Erik
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Erik de Castro Lopo
http://www.mega-nerd.com/