Removes the apt plugin (#73)

The APT processor is no longer needed, so the reference to
'net.ltgt.apt' can be removed.

In addition a folder could be specified (and added to the source set)

I had problems with the gradle wrapper task declaration, therore
I deleted it. The wrapper was upgraded to 5.6.2

Author: dgruntz

mapstruct-on-gradle/build.gradle

@@ -1,27 +1,22 @@
 plugins {
     id 'java'
-    id 'net.ltgt.apt' version '0.9'
 }
 
 repositories {
     mavenCentral()
     mavenLocal()
 }
 
-task wrapper(type: Wrapper) {
-    gradleVersion = '3.4'
-}
-
 ext {
     mapstructVersion = "1.3.1.Final"
 }
 
 sourceCompatibility = JavaVersion.VERSION_1_8
 
 dependencies {
-    compile "org.mapstruct:mapstruct:${mapstructVersion}"
-    testCompile 'org.testng:testng:6.10', 'org.easytesting:fest-assert:1.4'
-    apt "org.mapstruct:mapstruct-processor:${mapstructVersion}"
+    implementation "org.mapstruct:mapstruct:${mapstructVersion}"
+    testImplementation "org.testng:testng:6.10", "org.easytesting:fest-assert:1.4"
+    annotationProcessor "org.mapstruct:mapstruct-processor:1.3.1.Final"
 }
 
 tasks.withType(JavaCompile) {

mapstruct-on-gradle/gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,5 @@
-#Sat Feb 25 23:47:27 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4-bin.zip