fix(versions): push Activiti/activiti-build ref: master

Push version changes from the source code in repository: Activiti/activiti-build ref: master

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.activiti.build</groupId>
     <artifactId>activiti-parent</artifactId>
-    <version>7.0.18</version>
+    <version>7.0.20</version>
     <relativePath/>
   </parent>
   <groupId>org.activiti</groupId>