title: New-added Maven plugin becomes red in IntelliJ
body: <p>I'm following this <a href="https://maven.apache.org/maven-release/maven-release-plugin/usage.html" rel="noreferrer">guideline</a> for a Maven plugin, after which I've added the following:</p>
  
  <pre><code>&lt;plugin&gt;
    &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
    &lt;artifactId&gt;maven-release-plugin&lt;/artifactId&gt;
    &lt;version&gt;2.5.3&lt;/version&gt;
  &lt;/plugin&gt;
  </code></pre>
  
  <p><code>maven-release-plugin</code> &amp; <code>2.5.3</code> are both red. I'm using a local Maven repository. How can I update it? Do I need to install anything so that <em>IntelliJ</em> can find it? I'm new to Maven and would appreciate being pointed in the right direction.</p>