Update README.md add publication reference details

Author: DanuserLab

README.md

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 This suite of software was designed to detect morphological motifs, such as blebs, filopodia, and lamellipodia, from 3D images of surfaces, particularly images of cell surfaces.
 
-It is associated with the paper, [***Robust and automated detection of subcellular morphological motifs in 3D microscopy images***](https://doi.org/10.1038/s41592-019-0539-z), written by Meghan K. Driscoll, Erik S. Welf, Andrew R. Jamieson, Kevin M. Dean, Tadamoto Isogai, Reto Fiolka, and [Gaudenz Danuser](https://www.danuserlab-utsw.org/). 
+It is associated with the paper, [**Robust and automated detection of subcellular morphological motifs in 3D microscopy images**](https://doi.org/10.1038/s41592-019-0539-z), *Nature Methods*, 2019, 16, 1037–1044, written by Meghan K. Driscoll, Erik S. Welf, Andrew R. Jamieson, Kevin M. Dean, Tadamoto Isogai, Reto Fiolka, and [Gaudenz Danuser](https://www.danuserlab-utsw.org/). 
 
 For more information, please read the [User Guide](doc/usersGuide_usurface3D.pdf).