Won't build with latest purescript-colors 4.3.0

[metaleap]

using purs current master branch (prints --version as 0.11.6 dev build), attempting to pulp build build a project with purescript-css (got version 3.3.0 from Pursuit) in the deps (and insisting on purescript-colors 4.3.0) results in:

* Building project in /home/rox/c/ps/test-pscorefn-src
Compiling CSS.String
Compiling CSS.Property
Compiling CSS.Selector
Compiling CSS.Color
Error 1 of 2:

  at bower_components/purescript-css/src/CSS/Selector.purs line 25, column 8 - line 25, column 54
  
    Cannot derive a type class instance for
                                    
      Data.Generic.Generic Predicate
                                    
    since instances of this type class are not derivable.
    
    
  See https://github.com/purescript/documentation/blob/master/errors/CannotDerive.md for more information,
  or to contribute content related to this error.
  
Error 2 of 2:

  at bower_components/purescript-css/src/CSS/Property.purs line 20, column 8 - line 20, column 52
  
    Cannot derive a type class instance for
                                   
      Data.Generic.Generic Prefixed
                                   
    since instances of this type class are not derivable.

[garyb]

This is because current master doesn't allow deriving of the old Generic anymore rather than a dependency issue.

[metaleap]

Ah of course. Yeah I'm running into this quite a bit right now as I'm going through everything-on-Pursuit =)

[vyorkin]

Just thinking... does it make sense if I try and make a PR to use the generics-rep instead of generics? should be a pretty trivial change

[garyb]

Sure, or we can probably remove generics entirely - the need for deep generics isn't present anymore, so unless anything in here is being implemented with generics I don't think the instances are all that useful.