Updated to metrics4j 0.18.0

Author: brianhks

README.md

@@ -12,7 +12,7 @@ so they can be reported.
 1. Download the JMXReporter jar file.
 1. For your JMX application (say Kafka) add JMXReporter to the java command line
 as a javaagent (-javaagent:path_to_jxmreporter_jar)
-1. Place the following simple metrics4j.conf file in the applications classpath.
+1. Place the following simple metrics4j.conf file in the applications classpath.  Or specify the location with -DMETRICS4J_CONFIG=/path/to/metrics4j.conf
 ```hocon
 metrics4j: {
 	_dump-file: "dump.conf"

pom.xml

@@ -6,7 +6,7 @@
 
 	<groupId>org.kairosdb</groupId>
 	<artifactId>JMXReporter</artifactId>
-	<version>0.15.0</version>
+	<version>0.18.0</version>
 
 	<repositories>
 		<repository>
@@ -20,7 +20,7 @@
 		<dependency>
 			<groupId>org.kairosdb</groupId>
 			<artifactId>metrics4j</artifactId>
-			<version>0.15.0</version>
+			<version>0.18.0</version>
 		</dependency>
 
 		<dependency>