title: Maven build is not using the updated version of model(pom.xml)
body: <p>I have a maven project which I do get the new project version from user with:</p>
  
  <pre><code>Current Version = 1.0.0
  &lt;plugin&gt;
      &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt;
      &lt;artifactId&gt;versions-maven-plugin&lt;/artifactId&gt;
      &lt;version&gt;2.7&lt;/version&gt;
      &lt;executions&gt;
          &lt;execution&gt;
              &lt;phase&gt;validate&lt;/phase&gt;
                      &lt;goals&gt;
                          &lt;goal&gt;set&lt;/goal&gt;
                      &lt;/goals&gt;
              &lt;/execution&gt;
          &lt;/executions&gt;
      &lt;/plugin&gt;
  Current Version = 2.0.0
  </code></pre>
  
  <p>and after that I called my own custom plugin, which runs set of calculations and appends an String to  the version</p>
  
  <pre><code>Current Version = 2.0.0
  &lt;groupId&gt;mygroup&lt;/groupId&gt;
      &lt;artifactId&gt;my artifact&lt;/artifactId&gt;
      &lt;version&gt;1.0.0&lt;/version&gt;
      &lt;executions&gt;
         &lt;execution&gt;
          &lt;phase&gt;process-sources&lt;/phase&gt;
              &lt;goals&gt;
                  &lt;goal&gt;validate&lt;/goal&gt;
              &lt;/goals&gt;
          &lt;/execution&gt;
      &lt;/executions&gt;
  Current Version = 2.0.0-AddedString
  </code></pre>
  
  <p>but when I run other plugins, for example:</p>
  
  <pre><code>&lt;groupId&gt;com.github.ekryd.echo-maven-plugin&lt;/groupId&gt;
      &lt;artifactId&gt;echo-maven-plugin&lt;/artifactId&gt;
          &lt;executions&gt;
          &lt;execution&gt;
              &lt;id&gt;end&lt;/id&gt;
              &lt;goals&gt;
              &lt;goal&gt;echo&lt;/goal&gt;
              &lt;/goals&gt;
              &lt;phase&gt;process-resources&lt;/phase&gt;
              &lt;configuration&gt;
              &lt;message&gt;${project.version}&lt;/message&gt;
              &lt;/configuration&gt;
       &lt;/execution&gt;
  &lt;/executions&gt; 
  </code></pre>
  
  <p>which gives me the result of : "1.0.0" which should be  "2.0.0-AddedString"</p>
  
  <p>but why?
  and how to fix this? I need all plugins use the new version and work with that.</p>