Updates curator version to 5.7.1

Fixes gh-330

Author: spencergibb

spring-cloud-zookeeper-dependencies/pom.xml

@@ -14,7 +14,7 @@
 	<name>spring-cloud-zookeeper-dependencies</name>
 	<description>Spring Cloud Zookeeper Dependencies</description>
 	<properties>
-		<curator.version>5.1.0</curator.version>
+		<curator.version>5.7.1</curator.version>
 		<maven-checkstyle-plugin.failsOnError>true</maven-checkstyle-plugin.failsOnError>
 		<maven-checkstyle-plugin.failsOnViolation>true</maven-checkstyle-plugin.failsOnViolation>
 		<maven-checkstyle-plugin.includeTestSourceDirectory>true</maven-checkstyle-plugin.includeTestSourceDirectory>