Update parent version to 0.72.0.

Author: yegor256

pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.jcabi</groupId>
     <artifactId>parent</artifactId>
-    <version>0.71.0</version>
+    <version>0.72.0</version>
   </parent>
   <groupId>com.jcabi.incubator</groupId>
   <artifactId>xembly</artifactId>