Restore Ruby 2.5 compat

Author: webdev778

ruby/lib/interscript/dsl/group/parallel.rb

@@ -1,6 +1,6 @@
 class Interscript::DSL::Group::Parallel < Interscript::DSL::Group
-  def initialize(&block)
-    @node = Interscript::Node::Group::Parallel.new
+  def initialize(reverse_run: nil, &block)
+    @node = Interscript::Node::Group::Parallel.new(reverse_run: reverse_run)
     self.instance_exec(&block)
   end
 end