title: Command line way to generate HTML coverageReport in Jest
body: <p>In Jest, is there a way from the command line to generate an HTML coverage report if it is not defined in the jest.config.js files?</p>
  
  <p>I only want to generate the HTML report some of the time rather than every time I run Jest.  The only way I've been able to generate the HTML report was by changing the config manually.</p>