Add Maven build number in html pages during building process

I have a Maven project and my aim is to find a way how to append a build number during each build in existing html file. I have tried to deal with it via maven-war-plugin and classic ${build.number}, but unsuccessfully. Here are plugin settings:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <configuration>
        <webResources>
            <resource>
                <filtering>true</filtering>
                <!-- <targetPath>WEB-INF</targetPath>-->
                <directory>src/main/webapp/</directory>
                <includes>
                    <include>*.html</include>
                </includes>
            </resource>
        </webResources>
    </configuration>
</plugin>

I would be grateful for any ideas.

P.s. Is it obligatory to set <targetPath> in plugin or setting a <directory> is enough?