Update paper reference after publication

Also removed disabled svg badge from zenodo not supported by github at the moment

Author: iteal

README.md

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 Check the [Documentation website](https://iteal.github.io/wormpose/index.html) for detailed instructions.
 
 ## Read the paper
-*WormPose: Image synthesis and convolutional networks for pose estimation in C. elegans*  
-Laetitia Hebert, Tosif Ahamed, Antonio C. Costa, Liam O’Shaugnessy, Greg J. Stephens  
-bioRxiv 2020.07.09.193755; doi: https://doi.org/10.1101/2020.07.09.193755
+[WormPose: Image synthesis and convolutional networks for pose estimation in C. elegans](https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1008914)  
+Hebert L, Ahamed T, Costa AC, O’Shaughnessy L, Stephens GJ (2021) WormPose: Image synthesis and convolutional networks for pose estimation in C. elegans. PLOS Computational Biology 17(4): e1008914. https://doi.org/10.1371/journal.pcbi.1008914
 
 ## Manuscript data 
 Manuscript data is available here: https://wormpose.unit.oist.jp.