title: How i update mern 2.0 react version to (react v16.5.1)?
body: <p>I am trying to update the react version in the mern 2.0 boilerplate but, have lots of issues to update.</p>
  
  <p>I had got some util error in this code.</p>
  
  <p><strong>Warning: Accessing PropTypes via the main React package is deprecated, and will be removed in  React v16.0. Use the latest available v15.* prop-types package from npm instead. For info on usage, compatibility, migration and more ...</strong></p>
  
  <p><strong>Warning: Accessing createClass via the main React package is deprecated, and will be removed in React v16.0. Use a plain JavaScript class instead. If you're not yet ready to migrate, create-react-class v15.* is available on npm as a temporary, drop-in replacement ...</strong></p>