README.md in weak_parameters-0.4.3 vs README.md in weak_parameters-0.5.0

@@ -24,12 +24,12 @@
     string :name, required: true, except: ["charlie", "dave"], strong: true
     integer :type, only: 1..3, strong: true
     string :quantity do |value|
       value =~ /\A\d+(?:\.\d+)g\z/
     end
-    date :date, only: ["%Y/%m/%d", "%Y.%m.%d"]
-    time :time, only: "%Y/%m/%d %H:%M:%S"
+    date :date, format: ["%Y/%m/%d", "%Y.%m.%d"]
+    time :time, format: "%Y/%m/%d %H:%M:%S"
   end
 
   def create
     # pass the only parameters with strong option. like strong parameters.
     respond_with Recipe.create(permitted_params)
@@ -68,9 +68,10 @@
 * required
 * only
 * except
 * handler
 * strong
+* format (only for date and time)
 
 ## Tips
 WeakParameters.stats returns its validation metadata, and this is useful for auto-generating API documents.
 With [autodoc](https://github.com/r7kamura/autodoc), you can auto-generate API documents with params information.