Update Kotlin, Gradle and Spring Boot versions

Author: yole

tutorials/spring-boot-restful/build.gradle

@@ -1,19 +1,20 @@
 buildscript {
-    ext.kotlin_version = '1.1.3' // Required for Kotlin integration
-    ext.spring_boot_version = '1.5.4.RELEASE'
+    ext.kotlin_version = '1.3.10' // Required for Kotlin integration
+    ext.spring_boot_version = '2.1.0.RELEASE'
     repositories {
         jcenter()
     }
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" // Required for Kotlin integration
-        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin
+        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#spring-support
         classpath "org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version"
     }
 }
 
 apply plugin: 'kotlin' // Required for Kotlin integration
-apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin
+apply plugin: "kotlin-spring" // https://kotlinlang.org/docs/reference/compiler-plugins.html#spring-support
 apply plugin: 'org.springframework.boot'
+apply plugin: 'io.spring.dependency-management'
 
 jar {
     baseName = 'gs-rest-service'
@@ -26,6 +27,6 @@ repositories {
 
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration
-    compile 'org.springframework.boot:spring-boot-starter-web'
+    compile "org.springframework.boot:spring-boot-starter-web"
     testCompile('org.springframework.boot:spring-boot-starter-test')
 }

tutorials/spring-boot-restful/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-bin.zip