Travis CI: Dynamically add SonarQube plugin to build.gradle

build.gradle

@@ -1,11 +1,3 @@
-// SonarQube is currently only supported on Java 8
-// https://docs.sonarqube.org/display/SONAR/Requirements#Requirements-SupportedPlatforms
-if (JavaVersion.current() == JavaVersion.VERSION_1_8) {
-    plugins {
-        id "org.sonarqube" version "2.6.1"
-    }
-}
-
 // Exclude apps/ dir itself, but include its subdirs
 def javaProjects = subprojects - project(':apps')