old_contents: from django import template
  from ..decorators import parsley_form
  
  register = template.Library()
  
  
  @register.assignment_tag()
  def parsleyfy(form):
      return parsley_form(form)
  
new_contents: from django import template, VERSION
  
  from ..decorators import parsley_form
  
  register = template.Library()
  
  if VERSION[:2] >= (1, 9):
      # in django 1.9 and above, the simple_tag can do assignment
      tag_decorator = register.simple_tag
  else:
      # django 1.8 and below needs the assignment_tag
      tag_decorator = register.assignment_tag
  
  
  @tag_decorator()
  def parsleyfy(form):
      return parsley_form(form)
  
subject: remove warning for django > 1.9