old_contents: __version__ = '0.9.6'
  __all__ = ['const',
             'data_io',
             'ensemble',
             'feature_selection',
             'metrics',
             'model',
             'online_model',
             'preprocessing',
             'util']
  
new_contents: __version__ = '0.9.5'
  __all__ = ['const',
             'data_io',
             'ensemble',
             'feature_selection',
             'metrics',
             'model',
             'online_model',
             'preprocessing',
             'util']
  
subject: fix the wrong version: 0.9.6 --> 0.9.5