old_contents: """
      pyexcel_chart
      ~~~~~~~~~~~~~~~~~~~
  
      chart drawing plugin for pyexcel
  
      :copyright: (c) 2016-2017 by Onni Software Ltd.
      :license: New BSD License, see LICENSE for further details
  """
  from pyexcel.internal.common import PyexcelPluginList
  
  
  __pyexcel_plugins__ = PyexcelPluginList(__name__).add_a_renderer(
      submodule='chart',
      file_types=['svg'],
      stream_type='binary'
  )
  
new_contents: """
      pyexcel_chart
      ~~~~~~~~~~~~~~~~~~~
  
      chart drawing plugin for pyexcel
  
      :copyright: (c) 2016-2017 by Onni Software Ltd.
      :license: New BSD License, see LICENSE for further details
  """
  from pyexcel.internal.common import PyexcelPluginList
  
  
  PyexcelPluginList(__name__).add_a_renderer(
      submodule='chart.ChartRenderer',
      file_types=['svg'],
      stream_type='binary'
  )
  
subject: update io plugin interface