Update README.md

Author: sksamuel

README.md

@@ -2,7 +2,7 @@ scalac-scoverage-plugin
 ==========
 
 scoverage is a free Apache licensed code coverage tool for scala that offers statement and branch coverage.
-scoverage is available for both maven and sbt.
+scoverage is available for sbt, maven, and gradle.
 
 [![Build Status](https://travis-ci.org/scoverage/scalac-scoverage-plugin.svg?branch=master)](https://travis-ci.org/scoverage/scalac-scoverage-plugin)