Bump grunt-purescript to 0.6.0

Author: hdgarrood

package.json

@@ -2,7 +2,7 @@
   "private": true,
   "dependencies": {
     "grunt": "~0.4.4",
-    "grunt-purescript": "~0.5.1",
+    "grunt-purescript": "~0.6.0",
     "grunt-contrib-clean": "~0.5.0"
   }
 }