title: Trouble using karate.merge() function
body: <p>I'm trying to use the karate.merge() example, verbatim, from the README under the <strong>JSON Transforms</strong> section and it fails with:</p>
  
  <pre><code>javascript evaluation failed: karate.merge(foo, { b: 2 }), TypeError: karate.merge is not a function in &lt;eval&gt; at line number 1
  </code></pre>
  
  <pre><code>Scenario: merge
      * def foo = { a: 1 }
      * def bar = karate.merge(foo, { b: 2 })
      * match bar == { a: 1, b: 2 }
  </code></pre>
  
  <p>Can anyone help point out what I might be missing here?</p>