Update monoid dependency

Author: garyb

bower.json

@@ -19,7 +19,7 @@
   ],
   "dependencies": {
     "purescript-arrays": "~0.3.0",
-    "purescript-monoid": "~0.1.4",
+    "purescript-monoid": "~0.2.0",
     "purescript-control": "~0.2.1"
   }
 }