Update README.md

Author: Fivell

README.md

@@ -35,8 +35,8 @@ The `date_time_picker` input accepts many of the options available to the standa
 
 ```ruby
 form do |f|
-  f.input :starts_at, as: :datepicker, datepicker_options: { min_date: "2013-10-8",        max_date: "+3D" }
-  f.input :ends_at,   as: :datepicker, datepicker_options: { min_date: 3.days.ago.to_date, max_date: "+1W +5D" }
+  f.input :starts_at, as: :date_time_picker, datepicker_options: { min_date: "2013-10-8",        max_date: "+3D" }
+  f.input :ends_at,   as: :date_time_picker, datepicker_options: { min_date: 3.days.ago.to_date, max_date: "+1W +5D" }
 end
 ```