attempt to add a ci badge

Author: darrenjw

README.md

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 # scala-glm
 
+[![](https://github.com/darrenjw/scala-glm/actions/workflows/ci.yml/badge.svg)](https://github.com/darrenjw/scala-glm/actions)
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 ## Scala library for regression modelling
 
 Regression modelling, including fitting linear and generalised linear statistical models, diagnosing fit and making predictions. Diagnostic plots. Also, flexible regression modelling using orthogonal polynomials, cosine series, B-splines, etc. This library builds on top of [Breeze](https://github.com/scalanlp/breeze), and is aimed primarily at people already using Scala and Breeze who want more statistical functionality.