Merge pull request #619 from ocharles/patch-1

Link to Haskell bindings

README.md

@@ -50,6 +50,7 @@ Languages:
  * [D language API bindings](https://github.com/DerelictOrg/DerelictBgfx)
  * [Go language API bindings](https://github.com/james4k/go-bgfx)
  * [Java language API bindings](https://github.com/enleeten/twilight-bgfx)
+ * [Haskell language API bindings](https://github.com/haskell-game/bgfx)
 
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