Upgrade to Kotlin 1.2.20 (and Undertow 1.4.22)

build.gradle

@@ -14,7 +14,7 @@ buildscript {
 plugins {
 	id "com.gradle.build-scan" version "1.8"
 	id "io.spring.dependency-management" version "1.0.3.RELEASE" apply false
-	id "org.jetbrains.kotlin.jvm" version "1.2.10" apply false
+	id "org.jetbrains.kotlin.jvm" version "1.2.20" apply false
 	id "org.jetbrains.dokka" version "0.9.15"
 	id "org.asciidoctor.convert" version "1.5.6"
 }
@@ -50,7 +50,7 @@ configure(allprojects) { project ->
 	ext.junitJupiterVersion  = "5.0.3"
 	ext.junitPlatformVersion = "1.0.3"
 	ext.junitVintageVersion  = "4.12.3"
-	ext.kotlinVersion        = "1.2.10"
+	ext.kotlinVersion        = "1.2.20"
 	ext.log4jVersion         = "2.10.0"
 	ext.nettyVersion         = "4.1.19.Final"
 	ext.reactorVersion       = "Bismuth-BUILD-SNAPSHOT"
@@ -60,7 +60,7 @@ configure(allprojects) { project ->
 	ext.slf4jVersion         = "1.7.25"
 	ext.tiles3Version        = "3.0.8"
 	ext.tomcatVersion        = "8.5.24"
-	ext.undertowVersion      = "1.4.21.Final"
+	ext.undertowVersion      = "1.4.22.Final"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"