title: Logback conversion rule parametrizing
body: <p>Is there any way of parametrizing conversion rule in Logback?
  I've tried adding child nodes, additional attributes and I don't see a way to do it.</p>
  
  <pre><code>&lt;conversionRule conversionWord="boundedMsg" converterClass="com.package.util.logging.converters.LongMessageConverter"&gt;
  </code></pre>
  
  <p>I would like to add parameter that will be used by LongMessageConverter class.</p>
  
  <p>My application is setup on Spring Boot and I am using Sl4J.</p>