old_contents: __author__ = 'Daniel Greenfeld, Chris Adams'
  __version__ = "0.6.0"
  
  VERSION = __version__.split('.')
  
  def clean_html():
      raise ImportError("clean_html requires html5lib or pytidylib")
  
  def sanitize_html():
      raise ImportError("sanitize_html requires html5lib")
  
  
  try:
      import html5lib
      from .utils import clean_html5lib as clean_html
      from .utils import sanitize_html5lib as sanitize_html
  except ImportError:
      try:
          import tidylib
          from .utils import clean_tidylib as clean_html
      except ImportError:
          pass
  
new_contents: __author__ = 'Daniel Greenfeld, Chris Adams, Diederik van der Boor'
  __version__ = "0.6.0"
  
  VERSION = __version__.split('.')
  
  def clean_html():
      raise ImportError("clean_html requires html5lib or pytidylib")
  
  def sanitize_html():
      raise ImportError("sanitize_html requires html5lib")
  
  
  try:
      import html5lib
      from .utils import clean_html5lib as clean_html
      from .utils import sanitize_html5lib as sanitize_html
  except ImportError:
      try:
          import tidylib
          from .utils import clean_tidylib as clean_html
      except ImportError:
          pass
  
subject: Add @vdboor as author.