Upgrade to Kotlin 1.2.51

Author: sdeleuze

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 "1.2.41" apply false
+	id "org.jetbrains.kotlin.jvm" version "1.2.51" apply false
 	id "org.jetbrains.dokka" version "0.9.17"
 	id "org.asciidoctor.convert" version "1.5.6"
 }
@@ -45,7 +45,7 @@ ext {
 	junitJupiterVersion  = "5.0.3"
 	junitPlatformVersion = "1.0.3"
 	junitVintageVersion  = "4.12.3"
-	kotlinVersion        = "1.2.41"
+	kotlinVersion        = "1.2.51"
 	log4jVersion         = "2.11.0"
 	nettyVersion         = "4.1.25.Final"
 	reactorVersion       = "Bismuth-SR10"