readme haskell examples out of date

The readme has:
```haskell
-- Example 11 - the union of a square and a circle.
import Graphics.Implicit

out = union [
squareR 0 True (80, 80)
, translate (40, 40) (circle 30)
]

main = writeSVG 2 "test.svg" out
```
squareR is gone and tuples were replaced with V2 or V3 from the linear package:
```haskell
import Graphics.Implicit

out =
union
[ square True (V2 80 80),
translate (V2 40 40) (circle 30)
]

main = writeSVG 2 "test.svg" out
```