add due_date to pm issue batch params

app/controllers/api/pm/issues_controller.rb

@@ -182,7 +182,7 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
 
   def batch_issue_params
     params.permit(
-      :status_id, :priority_id, :milestone_id, :pm_sprint_id, :pm_issue_type, :root_id, :target_pm_project_id, :project_id,
+      :status_id, :priority_id, :milestone_id, :pm_sprint_id, :due_date, :pm_issue_type, :root_id, :target_pm_project_id, :project_id,
       :issue_tag_ids => [],
       :assigner_ids => [] )
   end