Update README.md

Author: jgabry

README.md

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 <img src="https://raw.githubusercontent.com/stan-dev/logos/master/logo.png" width=200 alt="Stan Logo"/>
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-ShinyStan v2.0.0
+ShinyStan
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 **ShinyStan** provides immediate, informative, customizable visual and 
 numerical summaries of model parameters and convergence diagnostics for