Remove pmd plugin

Author: pontusmelke

build.gradle

@@ -40,7 +40,6 @@ subprojects {
     apply plugin: 'distribution'
     apply plugin: 'com.github.johnrengelman.shadow'
     apply from: "$rootProject.projectDir/gradle/integration-test.gradle"
-    apply plugin: 'pmd'
     apply plugin: 'jacoco'
     apply plugin: 'info.solidsoft.pitest'