Upgrade Micrometer to 1.0.6

Author: garyrussell

build.gradle

@@ -136,7 +136,7 @@ subprojects { subproject ->
 		kryoShadedVersion = '3.0.3'
 		lettuceVersion = '5.0.3.RELEASE'
 		log4jVersion = '2.10.0'
-		micrometerVersion = '1.0.3'
+		micrometerVersion = '1.0.6'
 		mockitoVersion = '2.11.0'
 		mysqlVersion = '6.0.6'
 		pahoMqttClientVersion = '1.2.0'