Update gitignore for Haskell.

.gitignore

@@ -37,3 +37,29 @@ repl-temp-*
 */michelaben/index.js
 
 */michelaben/node_modules
+
+# Haskell
+
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.hie
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*