Upgrade JMH build plugins

This commit upgrades the Gradle JMH plugin to 0.6.8 and the companion
JMH version to 1.36.

build.gradle

@@ -10,7 +10,7 @@ plugins {
 	id 'com.github.ben-manes.versions' version '0.42.0'
 	id 'com.github.johnrengelman.shadow' version '7.1.2' apply false
 	id 'de.undercouch.download' version '5.1.0'
-	id 'me.champeau.jmh' version '0.6.6' apply false
+	id 'me.champeau.jmh' version '0.6.8' apply false
 }
 
 ext {

gradle/spring-module.gradle

@@ -8,8 +8,8 @@ apply plugin: 'me.champeau.jmh'
 apply from: "$rootDir/gradle/publications.gradle"
 
 dependencies {
-	jmh 'org.openjdk.jmh:jmh-core:1.32'
+	jmh 'org.openjdk.jmh:jmh-core:1.36'
-	jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.32'
+	jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.36'
 	jmh 'net.sf.jopt-simple:jopt-simple'
 }