Example which compiles (#33)

I'm not sure about this proposal. But I prefer examples that compile. Although I also see how this change distracts from the essence.

Author: danielkroeni

README.md

@@ -73,9 +73,11 @@ nix-shell --run docs
 
 ## Example
 ```haskell
+{-# LANGUAGE TypeApplications, ScopedTypeVariables #-}
 module Main where
 
 import qualified ArrayFire as A
+import           Control.Exception (catch)
 
 main :: IO ()
 main = print newArray `catch` (\(e :: A.AFException) -> print e)