old_contents: __version__ = '0.3-git'
  
new_contents: __version__ = '0.3-git'
  __bibtex__ = """@INPROCEEDINGS{astroML,
   author={{Vanderplas}, J.T. and {Connolly}, A.J.
           and {Ivezi{\'c}}, {\v Z}. and {Gray}, A.},
   booktitle={Conference on Intelligent Data Understanding (CIDU)},
   title={Introduction to astroML: Machine learning for astrophysics},
   month={Oct.},
   pages={47 -54},
   doi={10.1109/CIDU.2012.6382200},
   year={2012}
  }"""
  
subject: add astroML.__bibtex__ attribute