remove ruby 2 support

lib/delayed/performable_mailer.rb

@@ -3,7 +3,7 @@
 module Delayed
   class PerformableMailer < PerformableMethod
     def perform
-      mailer = super
+      mailer = object.send(method_name, *args, **kwargs)
       mailer.respond_to?(:deliver_now) ? mailer.deliver_now : mailer.deliver
     end
   end

lib/delayed/performable_method.rb

@@ -23,30 +23,8 @@ def display_name
       end
     end
 
-    def kwargs
-      # Default to a hash so that we can handle deserializing jobs that were
-      # created before kwargs was available.
-      @kwargs || {}
-    end
-
-    # In ruby 3 we need to explicitly separate regular args from the keyword-args.
-    if RUBY_VERSION >= '3.0'
-      def perform
-        object.send(method_name, *args, **kwargs) if object
-      end
-    else
-      # On ruby 2, rely on the implicit conversion from a hash to kwargs
-      def perform
-        return unless object
-
-        arguments = args.is_a?(Array) ? args : [args]
-
-        if kwargs.present?
-          object.send(method_name, *arguments, kwargs)
-        else
-          object.send(method_name, *arguments)
-        end
-      end
+    def perform
+      object.send(method_name, *args, **kwargs) if object
     end
 
     def method(sym)