title: Module 'jest-junit' in the testResultsProcessor option was not found
body: <p>I have setup <code>jest</code> and <code>jest-junit</code> as the reporter and followed the simple instructions given by jest-junit.</p>
  
  <p>This includes <code>npm install jest --save-dev</code> and  <code>npm install jest-junit --save-dev</code></p>
  
  <p>My <code>package.json</code> looks like this (excerpt):</p>
  
  <pre><code>  "devDependencies": { 
      "jest": "^22.4.4",
      "jest-junit": "^4.0.0",
    },
    "scripts": {
      "test": "jest --ci --testResultsProcessor='jest-junit'"
    },
    "jest": {
      "verbose": true,
      "testResultsProcessor": "jest-junit"
    },
    "jest-junit": {
      "suiteName": "Test Suite",
      "output": "./junit.xml"
    }
  </code></pre>
  
  <p>When running <code>npm run test</code> on my machine (OSX), it works well. When running it as part of the CI build process or on another Windows machine, I am getting the following error:</p>
  
  <p>Module 'jest-junit' in the testResultsProcessor option was not found.</p>