Update README.md

README.md

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 # SpatMCA: Regularized Spatial Maximum Covariance Analysis
 
 [![License](https://eddelbuettel.github.io/badges/GPL2+.svg)](https://www.gnu.org/licenses/gpl-2.0.html)
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+[![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/SpatMCA?color=green)](https://cran.r-project.org/package=SpatMCA)
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