title: Running mvn liquibase:updateSQL on a specific changeSet
body: <p>Somebody who's a more seasoned maven user can probably help me out here: </p>
  
  <p>how do I pass in "optional parameters" to liquibase when running it as a maven goal? </p>
  
  <p>I want to pass in "changesToApply", see <a href="http://www.liquibase.org/manual/maven_updatesql" rel="nofollow">http://www.liquibase.org/manual/maven_updatesql</a></p>
  
  <p>But what's the syntax? 
  Something like this, but not quite:</p>
  
  <pre><code>mvn liquibase:updateSQL -DchangesToApply=2
  </code></pre>