add BioEM arXiv reference to Cossio et al. paper [CI-skip]

README.md

@@ -10,7 +10,7 @@ Pilar Cossio, David Rohr, Fabio Baruffa, Markus Rampp, Volker Lindenstruth and G
 
 * [Cossio, P and Hummer, G. J Struct Biol. 2013 Dec;184(3):427-37. doi: 10.1016/j.jsb.2013.10.006.](http://www.ncbi.nlm.nih.gov/pubmed/24161733)
 
-* Cossio, P., Rohr, D., Baruffa, F., Rampp, M., Lindenstruth, V. and Hummer, G. "BioEM: GPU-accelerated computing of Bayesian inference of electron microscopy images" (in preparation)
+* Cossio, P., Rohr, D., Baruffa, F., Rampp, M., Lindenstruth, V. and Hummer, G. "BioEM: GPU-accelerated computing of Bayesian inference of electron microscopy images" Comp. Phys. Comm accepted, [arXiv:1609.06634](https://arxiv.org/abs/1609.06634)
 
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