update deps

Author: jdegoes

bower.json

@@ -22,7 +22,7 @@
     "purescript-either":        "~0.1.3",
     "purescript-maybe":         "~0.2.1",
     "purescript-arrays":        "~0.2.1",
-    "purescript-strings":       "~0.3.0",
+    "purescript-strings":       "~0.4.0",
     "purescript-foldable-traversable": "~0.1.3"
   }
 }