Remove errorprone

dd-trace-java.gradle

@@ -2,7 +2,6 @@ plugins {
   id 'io.franzbecker.gradle-lombok' version '1.14'
   id 'com.jfrog.artifactory' version '4.8.1'
   id 'com.jfrog.bintray' version '1.8.4'
-  id 'net.ltgt.errorprone' version '0.0.14' // FIXME: this is really old!
   id 'org.unbroken-dome.test-sets' version '1.5.2'
 
   id 'com.gradle.build-scan' version '1.16' // 2.0+ requires gradle 5

gradle/java.gradle

@@ -15,17 +15,6 @@ lombok { // optional: values below are the defaults
   sha256 = ""
 }
 
-if (project.hasProperty('enableErrorProne')) {
-  apply plugin: "net.ltgt.errorprone"
-  tasks.withType(JavaCompile) {
-    outputs.upToDateWhen { false }
-    options.compilerArgs += ['-Xep:FutureReturnValueIgnored:OFF']
-    // workaround for: https://github.com/google/error-prone/issues/780
-    options.compilerArgs += ['-Xep:ParameterName:OFF']
-    options.compilerArgs += ['-XepDisableWarningsInGeneratedCode']
-  }
-}
-
 apply plugin: "eclipse"
 eclipse {
   classpath {