Update README.md

README.md

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 A plugin for generating BuildConstants for any kind of Gradle projects: Java, Kotlin, Groovy, etc.
 Designed for KTS scripts, with *experimental* support for Kotlin's **multi-platform** plugin
 
+![GitHub](https://img.shields.io/github/license/gmazzo/gradle-buildconfig-plugin)
 [![Plugins Site](https://img.shields.io/maven-metadata/v/https/plugins.gradle.org/m2/com/github/gmazzo/gradle-buildconfig-plugin/maven-metadata.xml.svg?label=gradle-plugins)](https://plugins.gradle.org/plugin/com.github.gmazzo.buildconfig)
 [![Build Status](https://travis-ci.com/gmazzo/gradle-buildconfig-plugin.svg?branch=master)](https://travis-ci.com/gmazzo/gradle-buildconfig-plugin)
 [![codecov](https://codecov.io/gh/gmazzo/gradle-buildconfig-plugin/branch/master/graph/badge.svg)](https://codecov.io/gh/gmazzo/gradle-buildconfig-plugin)