title: slf4j.Logger does not show value
body: <p>Why the value 12 doesnt appear?</p>
  
  <p>Code:</p>
  
  <pre><code>logger.info("height", 12);
  </code></pre>
  
  <p>Stacktrace:</p>
  
  <pre><code>13:41:29.022 [JavaFX Application Thread] INFO com.math.pro.ak.fragment.dashboard.LoginController - height
  </code></pre>
  
  <p>logback.xml</p>
  
  <pre><code>&lt;configuration&gt;
  
      &lt;appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"&gt;
          &lt;layout class="ch.qos.logback.classic.PatternLayout"&gt;
              &lt;Pattern&gt;
                  %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
              &lt;/Pattern&gt;
          &lt;/layout&gt;
      &lt;/appender&gt;
  
      &lt;logger name="com.math.pro.ak" level="debug"
          additivity="false"&gt;
          &lt;appender-ref ref="STDOUT" /&gt;
      &lt;/logger&gt;
  
      &lt;root level="error"&gt;
          &lt;appender-ref ref="STDOUT" /&gt;
      &lt;/root&gt;
  
  &lt;/configuration&gt;
  </code></pre>