Update README.md

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README.md

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 # LikelihoodProfiler
 
 [![Documentation](https://img.shields.io/badge/docs-latest-blue.svg)](https://insysbio.github.io/LikelihoodProfiler.jl/latest)
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+[![Build status](https://github.com/insysbio/LikelihoodProfiler.jl/workflows/CI/badge.svg)](https://github.com/insysbio/LikelihoodProfiler.jl/actions?query=workflow%3ACI)
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@@ -66,4 +66,4 @@ plot(res_1)
 
 **Borisov I, Metelkin E** (2020) *Confidence intervals by constrained optimization—An algorithm and software package for practical identifiability analysis in systems biology.* PLoS Comput Biol 16(12): e1008495.
 
-Ref: <https://doi.org/10.1371/journal.pcbi.1008495>
+Ref: <https://doi.org/10.1371/journal.pcbi.1008495>