title: How to use contextdata in node-nlp properly?
body: <p>I am currently trying to create a chatbot and adding some contextdata to it, like in this example: <a href="https://github.com/axa-group/nlp.js/tree/master/examples/14-ner-corpus" rel="nofollow noreferrer">https://github.com/axa-group/nlp.js/tree/master/examples/14-ner-corpus</a></p>
  <p>I have tried several variants of configs, filenames, file paths etc. I even looked up the source code if the contextdata corpus gets read, which it does.</p>
  <p>But at the end when running my code against &quot;what is the real name of spiderman?&quot; the {{ hero }} part gets replaced, but the {{ _data[entities.hero.option].realName }} doesn't.</p>
  <p>My code currently looks like this:</p>
  <pre><code>import { NlpManager, ConversationContext } from 'node-nlp'
  const manager = new NlpManager({
      languages: ['en'],
      forceNER: true,
      autoSave: false,
      nlu: { useNoneFeature: true }
  })
  const context = new ConversationContext()
  manager.addCorpora('./corpus.json')
  await manager.train()
  
  const response = await manager.process(
      'en',
      'what is the real name of spiderman?',
      context
  )
  console.log(response)
  
  </code></pre>
  <p>The corpus files i use are those linked in the example above:</p>
  <p><a href="https://github.com/axa-group/nlp.js/blob/master/examples/14-ner-corpus/corpus.json" rel="nofollow noreferrer">https://github.com/axa-group/nlp.js/blob/master/examples/14-ner-corpus/corpus.json</a></p>
  <p><a href="https://github.com/axa-group/nlp.js/blob/master/examples/14-ner-corpus/heros.json" rel="nofollow noreferrer">https://github.com/axa-group/nlp.js/blob/master/examples/14-ner-corpus/heros.json</a></p>
  <p>I hope someone can give me a pointer at what i am doing wrong here.</p>