Upgrade to Atomix 2.0.18

Change-Id: I433e8b85d5aad007531c24495dd8298aeef9f79e
diff --git a/core/store/primitives/pom.xml b/core/store/primitives/pom.xml
index ad29c36..aaa9bdf 100644
--- a/core/store/primitives/pom.xml
+++ b/core/store/primitives/pom.xml
@@ -69,7 +69,7 @@
         <dependency>
             <groupId>io.atomix</groupId>
             <artifactId>atomix</artifactId>
-            <version>2.0.16</version>
+            <version>2.0.18</version>
         </dependency>
 
         <dependency>