title: Unable to declare multiline string in JS File with ES6 format
body: <p>I am trying to declare multiline string variable in a JS file. However it seems that Karate won't let me to declare the string in ES6 format such as:</p>
  
  <pre><code>var stringQuery =
  `
  multiline
  string
  `
  </code></pre>
  
  <p>The execution will be failed complaining it does not match requirement. Is it currently impossible to do this in Karate? Or is there any workaround to achieve such feat?
  Any help will be greatly appreciated. Thanks.</p>