ihaskell-diagrams: Diagram type has changed

We now need to specify the numeric type and vector space explicitly
since these are given via type synonym family in `Diagram`

ihaskell-display/ihaskell-diagrams/IHaskell/Display/Diagrams.hs

@@ -12,13 +12,13 @@ import Diagrams.Backend.Cairo
 
 import IHaskell.Display
 
-instance IHaskellDisplay (Diagram Cairo R2) where
+instance IHaskellDisplay (QDiagram Cairo V2 Double Any) where
   display renderable = do
     png <- diagramData renderable PNG
     svg <- diagramData renderable SVG
     return $ Display [png, svg]
 
-diagramData :: Diagram Cairo R2 -> OutputType -> IO DisplayData
+diagramData :: Diagram Cairo -> OutputType -> IO DisplayData
 diagramData renderable format = do
   switchToTmpDir
 
@@ -45,5 +45,5 @@ diagramData renderable format = do
     extension PNG = "png"
 
 -- Rendering hint.
-diagram :: Diagram Cairo R2 -> Diagram Cairo R2
+diagram :: Diagram Cairo -> Diagram Cairo
 diagram = id