old_contents: # -*- coding: utf-8 -*-
  # © 2015-2017 Elico corp (http://www.elico-corp.com)
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from openerp import fields,models
  
  
  class ProjectTask(models.Model):
      _inherit = 'project.task'
  
      wbs = fields.Char('WBS', help="Work Breakdown Structure")
  
new_contents: # -*- coding: utf-8 -*-
  # © 2015-2017 Elico corp (http://www.elico-corp.com)
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from openerp import fields, models
  
  
  class ProjectTask(models.Model):
      _inherit = 'project.task'
  
      wbs = fields.Char('WBS', help="Work Breakdown Structure")
  
subject: modify the travis error