Upgrade to Dropwizard Metrics 3.1.1

Closes gh-2731

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -59,7 +59,7 @@
 		<commons-pool2.version>2.2</commons-pool2.version>
 		<crashub.version>1.3.1</crashub.version>
 		<derby.version>10.10.2.0</derby.version>
-		<dropwizard-metrics.version>3.1.0</dropwizard-metrics.version>
+		<dropwizard-metrics.version>3.1.1</dropwizard-metrics.version>
 		<flyway.version>3.1</flyway.version>
 		<freemarker.version>2.3.22</freemarker.version>
 		<gemfire.version>7.0.2</gemfire.version>