Bump org.apache.zookeeper:zookeeper from 3.7.1 to 3.7.2 (#149)

Bumps org.apache.zookeeper:zookeeper from 3.7.1 to 3.7.2.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-type: direct:production
...

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pom.xml

@@ -15,7 +15,7 @@
   <properties>
     <stack.version>5.0.0-SNAPSHOT</stack.version>
     <curator.version>5.4.0</curator.version>
-    <zookeeper.version>3.7.1</zookeeper.version>
+    <zookeeper.version>3.7.2</zookeeper.version>
     <junit.version>4.13.1</junit.version>
     <asciidoc.dir>${project.basedir}/src/main/asciidoc</asciidoc.dir>
     <jar.manifest>${project.basedir}/src/main/resources/META-INF/MANIFEST.MF</jar.manifest>