Maven warning when run `mvn install`

[hc825b]

I saw Maven warnings when compiling using mvn install.
We might want to resolve the warning.

...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for cyphyhouse:koord:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. @ line 73, column 21
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
...