Use the badge for scala version support

Author: scorebot

README.md

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 # PMML4S-Spark
 [![Build Status](https://github.com/autodeployai/pmml4s-spark/workflows/Release/badge.svg)](https://github.com/autodeployai/pmml4s-spark/actions)
-[![Maven Central](https://img.shields.io/maven-central/v/org.pmml4s/pmml4s-spark_2.12.svg)](https://mvnrepository.com/artifact/org.pmml4s/pmml4s-spark)
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+[![pmml4s-spark Scala version support](https://index.scala-lang.org/autodeployai/pmml4s-spark/pmml4s-spark/latest-by-scala-version.svg?platform=jvm)](https://index.scala-lang.org/autodeployai/pmml4s-spark/pmml4s-spark)
 _PMML4S-Spark_ is a PMML (Predictive Model Markup Language) scoring library for Spark as SparkML Transformer.
 
 ## Features