README.md: Petite modif, indication de la ref sur HAL.

README.md

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 # PouzatDetorakisEuroScipy2014
-A reproducible document with an extended version of [SPySort: Neuronal Spike Sorting with Python](http://arxiv.org/abs/1412.6383) Proceedings of the 7th European Conference on Python in Science ([EuroSciPy 2014](http://arxiv.org/html/1412.7030v1)), edited by Pierre de Buyl and Nelle Varoquaux, pp. 27–34.
+A reproducible document with an extended version of [SPySort: Neuronal Spike Sorting with Python](http://arxiv.org/abs/1412.6383) Proceedings of the 7th European Conference on Python in Science ([EuroSciPy 2014](http://arxiv.org/html/1412.7030v1)), edited by Pierre de Buyl and Nelle Varoquaux, pp. 27–34. The [pdf version](https://hal.archives-ouvertes.fr/hal-01111654v1) of this document is available on [HAL](https://hal.archives-ouvertes.fr/) (hal-01111654, version 1).
 
 This is mainly an [org](http://orgmode.org/) file meaning a pure UTF-8 file, and an associated BibTeX file. To regenerate the analysis automatically, you need [emacs](http://www.gnu.org/software/emacs/emacs.html) and [Python](https://www.python.org/) 3 or 2.