rename lambda references to use shorthand syntax

config/application.rb

@@ -21,7 +21,7 @@ module Danbooru
     config.action_mailer.delivery_method = :smtp
     config.action_mailer.smtp_settings = {:enable_starttls_auto => false}
     config.action_mailer.perform_deliveries = true
-    config.log_tags = [lambda {|req| "PID:#{Process.pid}"}]
+    config.log_tags = [->(req) {"PID:#{Process.pid}"}]
     config.action_controller.action_on_unpermitted_parameters = :raise
     config.force_ssl = true
 

config/initializers/simple_form.rb

@@ -101,7 +101,7 @@ SimpleForm.setup do |config|
   # config.item_wrapper_class = nil
 
   # How the label text should be generated altogether with the required text.
-  # config.label_text = lambda { |label, required, explicit_label| "#{required} #{label}" }
+  # config.label_text = ->(label, required, explicit_label) { "#{required} #{label}" }
 
   # You can define the class to use on all labels. Default is nil.
   # config.label_class = nil