title: Create fat jar from kotlin multiplatform project
body: <p>I recently switched from old 1.2 multiplatform into 1.3. Difference is, there's one one build.gradle file per multiplatform module (I got 5 of them) so a lot less configuration.
  However I can't seem to be able to configure creating runnable fat jar with all dependencies from jvm platform.
  I used to use standard "application" plugin in my jvm project and jar task, but that does not work anymore. I found there's "jvmJar" task and I modified it (set Main-class), but created jar doesn't contain dependencies and crashes on ClassNotFoundException. How do I do it?</p>
  
  <p>This is what I have now:</p>
  
  <pre><code>    jvm() {
          jvmJar {
              manifest {
                  attributes 'Main-Class': 'eu.xx.Runner'
              }
              from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
          }
  
      }
  </code></pre>