Add an option to not automatically sign in a user after changing a password (#4569)

lib/generators/templates/devise.rb

@@ -9,7 +9,7 @@ Devise.setup do |config|
   # Devise will use the `secret_key_base` as its `secret_key`
   # by default. You can change it below and use your own secret key.
   # config.secret_key = '<%= SecureRandom.hex(64) %>'
-  
+
   # ==> Controller configuration
   # Configure the parent class to the devise controllers.
   # config.parent_controller = 'DeviseController'
@@ -290,4 +290,10 @@ Devise.setup do |config|
   # ActiveSupport.on_load(:devise_failure_app) do
   #   include Turbolinks::Controller
   # end
+
+  # ==> Configuration for :registerable
+
+  # When set to false, does not sign a user in automatically after their password is
+  # changed. Defaults to true, so a user is signed in automatically after changing a password.
+  # config.sign_in_after_change_password = true
 end